diff --git a/src/blocks/scratch3_control.js b/src/blocks/scratch3_control.js
index ebf1951514e..c5dd04728e9 100644
--- a/src/blocks/scratch3_control.js
+++ b/src/blocks/scratch3_control.js
@@ -193,7 +193,7 @@ class Scratch3ControlBlocks {
     }
 
     allAtOnce (args, util) {
-        // Since the "all at once" block is implemented for compatiblity with
+        // Since the "all at once" block is implemented for compatibility with
         // Scratch 2.0 projects, it behaves the same way it did in 2.0, which
         // is to simply run the contained script (like "if 1 = 1").
         // (In early versions of Scratch 2.0, it would work the same way as
diff --git a/src/blocks/scratch3_data.js b/src/blocks/scratch3_data.js
index 1290434b430..11cdc21ee5e 100644
--- a/src/blocks/scratch3_data.js
+++ b/src/blocks/scratch3_data.js
@@ -202,7 +202,7 @@ class Scratch3DataBlocks {
         // We don't bother using .indexOf() at all, because it would end up with
         // edge cases such as the index of '123' in [4, 7, 123, '123', 9].
         // If we use indexOf(), this block would return 4 instead of 3, because
-        // indexOf() sees the first occurence of the string 123 as the fourth
+        // indexOf() sees the first occurrence of the string 123 as the fourth
         // item in the list. With Scratch, this would be confusing -- after all,
         // '123' and 123 look the same, so one would expect the block to say
         // that the first occurrence of '123' (or 123) to be the third item.
diff --git a/src/compiler/enums.js b/src/compiler/enums.js
index 1d493bf4884..a907243c943 100644
--- a/src/compiler/enums.js
+++ b/src/compiler/enums.js
@@ -10,7 +10,7 @@
  *
  * At compile time, often we don't know exactly type a value will be but we can tell it must be one of a
  * set of types. For this reason, the number value of each type represents a possibility space, where set
- * bits indicate that their corropoding type *could* be encountered at runtime.
+ * bits indicate that their corresponding type *could* be encountered at runtime.
  * For example, a type of InputType.NUMBER | InputType.STRING means the value will be either a number or
  * a string at runtime, the compiler can't tell which, but we do know that it's not a boolean or NaN as
  * those bits are not set.
@@ -31,11 +31,11 @@ const InputType = {
     NUMBER_ZERO: 0x008,
     /** The value -0 */
     NUMBER_NEG_ZERO: 0x010,
-    /** Any negitive integer excluding -0 */
+    /** Any negative integer excluding -0 */
     NUMBER_NEG_INT: 0x020,
-    /** Any negitive fractional number, excluding integers. */
+    /** Any negative fractional number, excluding integers. */
     NUMBER_NEG_FRACT: 0x040,
-    /** Any negitive number excluding -0 and -Infinity. Equal to NUMBER_NEG_INT | NUMBER_NEG_FRACT */
+    /** Any negative number excluding -0 and -Infinity. Equal to NUMBER_NEG_INT | NUMBER_NEG_FRACT */
     NUMBER_NEG_REAL: 0x060,
     /** The value -Infinity */
     NUMBER_NEG_INF: 0x080,
@@ -49,7 +49,7 @@ const InputType = {
     NUMBER_INF: 0x081,
     /** Any positive number, excluding 0. Equal to NUMBER_POS_REAL | NUMBER_POS_INF */
     NUMBER_POS: 0x007,
-    /** Any negitive number, excluding -0. Equal to NUMBER_NEG_REAL | NUMBER_NEG_INF */
+    /** Any negative number, excluding -0. Equal to NUMBER_NEG_REAL | NUMBER_NEG_INF */
     NUMBER_NEG: 0x0E0,
     /** Any whole number. Equal to NUMBER_POS_INT | NUMBER_ZERO */
     NUMBER_WHOLE: 0x00A,
@@ -66,12 +66,12 @@ const InputType = {
     NUMBER: 0x0FF,
     /** Any number, including NaN. Equal to NUMBER | NUMBER_NAN */
     NUMBER_OR_NAN: 0x1FF,
-    /** Anything that can be interperated as a number. Equal to NUMBER | STRING_NUM | BOOLEAN */
+    /** Anything that can be interpreted as a number. Equal to NUMBER | STRING_NUM | BOOLEAN */
     NUMBER_INTERPRETABLE: 0x12FF,
 
-    /** Any string which as a non-NaN neumeric interpretation, excluding ''.  */
+    /** Any string which as a non-NaN numeric interpretation, excluding ''.  */
     STRING_NUM: 0x200,
-    /** Any string which has no non-NaN neumeric interpretation, including ''. */
+    /** Any string which has no non-NaN numeric interpretation, including ''. */
     STRING_NAN: 0x400,
     /** Either of the strings 'true' or 'false'. */
     STRING_BOOLEAN: 0x800,
@@ -81,7 +81,7 @@ const InputType = {
 
     /** Any boolean. */
     BOOLEAN: 0x1000,
-    /** Any input that can be interperated as a boolean. Equal to BOOLEAN | STRING_BOOLEAN */
+    /** Any input that can be interpreted as a boolean. Equal to BOOLEAN | STRING_BOOLEAN */
     BOOLEAN_INTERPRETABLE: 0x1800,
 
     /** Any value type (a type a scratch variable can hold). Equal to NUMBER_OR_NAN | STRING | BOOLEAN */
@@ -120,10 +120,10 @@ const StackOpcode = {
     CONTROL_WAIT: 'control.wait',
     CONTROL_WAIT_UNTIL: 'control.waitUntil',
     CONTROL_CLEAR_COUNTER: 'control.counterClear',
-    CONTORL_INCR_COUNTER: 'control.counterIncr',
+    CONTROL_INCR_COUNTER: 'control.counterIncr',
 
     LIST_ADD: 'list.add',
-    LIST_INSERT: 'list.instert',
+    LIST_INSERT: 'list.insert',
     LIST_REPLACE: 'list.replace',
     LIST_DELETE_ALL: 'list.deleteAll',
     LIST_DELETE: 'list.delete',
diff --git a/src/compiler/irgen.js b/src/compiler/irgen.js
index 08d1701fbb3..e7cb6226582 100644
--- a/src/compiler/irgen.js
+++ b/src/compiler/irgen.js
@@ -14,7 +14,7 @@ const {
     IntermediateScript,
     IntermediateRepresentation
 } = require('./intermediate');
-const oldCompilerCompatiblity = require('./old-compiler-compatibility.js');
+const oldCompilerCompatibility = require('./old-compiler-compatibility.js');
 
 /**
  * @fileoverview Generate intermediate representations from Scratch blocks.
@@ -99,8 +99,8 @@ class ScriptTreeGenerator {
         }
 
         this.oldCompilerStub = (
-            oldCompilerCompatiblity.enabled ?
-                new oldCompilerCompatiblity.ScriptTreeGeneratorStub(this) :
+            oldCompilerCompatibility.enabled ?
+                new oldCompilerCompatibility.ScriptTreeGeneratorStub(this) :
                 null
         );
     }
@@ -701,7 +701,7 @@ class ScriptTreeGenerator {
         case 'control_clear_counter':
             return new IntermediateStackBlock(StackOpcode.CONTROL_CLEAR_COUNTER);
         case 'control_incr_counter':
-            return new IntermediateStackBlock(StackOpcode.CONTORL_INCR_COUNTER);
+            return new IntermediateStackBlock(StackOpcode.CONTROL_INCR_COUNTER);
 
         case 'data_addtolist':
             return new IntermediateStackBlock(StackOpcode.LIST_ADD, {
@@ -1363,7 +1363,7 @@ class ScriptTreeGenerator {
 
         if (this.thread.stackClick) {
             // We still need to treat the hat as a normal block (so executableHat should be false) for
-            // interpreter parity, but the reuslt is ignored.
+            // interpreter parity, but the result is ignored.
             const opcodeFunction = this.runtime.getOpcodeFunction(opcode);
             if (opcodeFunction) {
                 return new IntermediateStack([
diff --git a/src/compiler/jsgen.js b/src/compiler/jsgen.js
index ebbdc6bf4f5..d2ca329e602 100644
--- a/src/compiler/jsgen.js
+++ b/src/compiler/jsgen.js
@@ -662,7 +662,7 @@ class JSGenerator {
         case StackOpcode.CONTROL_CLEAR_COUNTER:
             this.source += 'runtime.ext_scratch3_control._counter = 0;\n';
             break;
-        case StackOpcode.CONTORL_INCR_COUNTER:
+        case StackOpcode.CONTROL_INCR_COUNTER:
             this.source += 'runtime.ext_scratch3_control._counter++;\n';
             break;
 
diff --git a/src/engine/blocks.js b/src/engine/blocks.js
index 68b3e606e7a..9e146618774 100644
--- a/src/engine/blocks.js
+++ b/src/engine/blocks.js
@@ -77,7 +77,7 @@ class Blocks {
             _monitored: null,
 
             /**
-             * A cache of hat opcodes to collection of theads to execute.
+             * A cache of hat opcodes to collection of threads to execute.
              * @type {object.<string, object>}
              */
             scripts: {},
diff --git a/src/engine/execute.js b/src/engine/execute.js
index c9f2f115e06..14784f1e5b6 100644
--- a/src/engine/execute.js
+++ b/src/engine/execute.js
@@ -5,7 +5,7 @@ const Thread = require('./thread');
 const cast = require('../util/cast');
 
 /**
- * Single BlockUtility instance reused by execute for every pritimive ran.
+ * Single BlockUtility instance reused by execute for every primitive ran.
  * @const
  */
 const blockUtility = new BlockUtility();
@@ -258,7 +258,7 @@ class BlockCached {
 
         /**
          * An arguments object for block implementations. All executions of this
-         * specific block will use this objecct.
+         * specific block will use this object.
          * @type {object}
          */
         this._argValues = {
@@ -357,7 +357,7 @@ class BlockCached {
         // Cache all input children blocks in the operation lists. The
         // operations can later be run in the order they appear in correctly
         // executing the operations quickly in a flat loop instead of needing to
-        // recursivly iterate them.
+        // recursively iterate them.
         for (const inputName in this._inputs) {
             const input = this._inputs[inputName];
             if (input.block) {
diff --git a/src/engine/profiler.js b/src/engine/profiler.js
index bfb47e61758..00e0657160c 100644
--- a/src/engine/profiler.js
+++ b/src/engine/profiler.js
@@ -101,7 +101,7 @@ class ProfilerFrame {
 
         /**
          * The depth of the recorded frame. This can help compare recursive
-         * funtions that are recorded. Each level of recursion with have a
+         * functions that are recorded. Each level of recursion with have a
          * different depth value.
          * @type {number}
          */
@@ -288,7 +288,7 @@ class Profiler {
                 // Remove this frames totalTime from the parent's selfTime.
                 stack[depth - 1].selfTime -= frame.totalTime;
 
-                // This frame occured once.
+                // This frame occurred once.
                 frame.count = 1;
 
                 this.onFrame(frame);
diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index e017bcb30c4..8d6758d1d1e 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -111,7 +111,7 @@ const ArgumentTypeMap = (() => {
     };
     map[ArgumentType.IMAGE] = {
         // Inline images are weird because they're not actually "arguments".
-        // They are more analagous to the label on a block.
+        // They are more analogous to the label on a block.
         fieldType: 'field_image'
     };
     map[ArgumentType.COSTUME] = {
@@ -344,7 +344,7 @@ class Runtime extends EventEmitter {
          */
         this.currentStepTime = 1000 / 30;
 
-        // Set an intial value for this.currentMSecs
+        // Set an initial value for this.currentMSecs
         this.updateCurrentMSecs();
 
         /**
@@ -391,7 +391,7 @@ class Runtime extends EventEmitter {
         const newCloudDataManager = cloudDataManager(this.cloudOptions);
 
         /**
-         * Check wether the runtime has any cloud data.
+         * Check whether the runtime has any cloud data.
          * @type {function}
          * @return {boolean} Whether or not the runtime currently has any
          * cloud variables.
@@ -1432,7 +1432,7 @@ class Runtime extends EventEmitter {
             break;
         }
 
-        // Allow extensiosn to override outputShape
+        // Allow extension to override outputShape
         if (blockInfo.blockShape) {
             blockJSON.outputShape = blockInfo.blockShape;
         }
@@ -1582,7 +1582,7 @@ class Runtime extends EventEmitter {
     }
 
     /**
-     * Helper for _convertPlaceholdes which handles inline images which are a specialized case of block "arguments".
+     * Helper for _convertPlaceholders which handles inline images which are a specialized case of block "arguments".
      * @param {object} argInfo Metadata about the inline image as specified by the extension
      * @return {object} JSON blob for a scratch-blocks image field.
      * @private
@@ -2339,7 +2339,7 @@ class Runtime extends EventEmitter {
     /**
      * Move a target in the execution order by a relative amount.
      *
-     * A positve number will make the target execute earlier. A negative number
+     * A positive number will make the target execute earlier. A negative number
      * will make the target execute later in the order.
      *
      * @param {Target} executableTarget target to move
@@ -3388,7 +3388,7 @@ class Runtime extends EventEmitter {
     }
 
     /**
-     * @deprecated Used by old versions of TurboWarp. Superceded by upstream's quit()
+     * @deprecated Used by old versions of TurboWarp. Superseded by upstream's quit()
      */
     stop () {
         this.quit();
diff --git a/src/engine/sequencer.js b/src/engine/sequencer.js
index c374fb694b9..7daf2a609e6 100644
--- a/src/engine/sequencer.js
+++ b/src/engine/sequencer.js
@@ -71,7 +71,7 @@ class Sequencer {
     stepThreads () {
         // Work time is 75% of the thread stepping interval.
         const WORK_TIME = 0.75 * this.runtime.currentStepTime;
-        // For compatibility with Scatch 2, update the millisecond clock
+        // For compatibility with Scratch 2, update the millisecond clock
         // on the Runtime once per step (see Interpreter.as in Scratch 2
         // for original use of `currentMSecs`)
         this.runtime.updateCurrentMSecs();
diff --git a/src/engine/target.js b/src/engine/target.js
index 931ec3c1fc9..b9c7a789b5a 100644
--- a/src/engine/target.js
+++ b/src/engine/target.js
@@ -110,7 +110,7 @@ class Target extends EventEmitter {
     }
 
     /**
-     * Clear all edge-activaed hat values.
+     * Clear all edge-activated hat values.
      */
     clearEdgeActivatedValues () {
         this._edgeActivatedHatValues = {};
@@ -776,7 +776,7 @@ class Target extends EventEmitter {
         // Handle global var conflicts with existing global vars (e.g. a sprite is uploaded, and has
         // blocks referencing some variable that the sprite does not own, and this
         // variable conflicts with a global var)
-        // In this case, we want to merge the new variable referenes with the
+        // In this case, we want to merge the new variable references with the
         // existing global variable
         for (const conflictId in conflictIdsToReplace) {
             const existingId = conflictIdsToReplace[conflictId];
@@ -786,7 +786,7 @@ class Target extends EventEmitter {
 
         // Handle global var conflicts existing local vars (e.g a sprite is uploaded,
         // and has blocks referencing some variable that the sprite does not own, and this
-        // variable conflcits with another sprite's local var).
+        // variable conflicts with another sprite's local var).
         // In this case, we want to go through the variable references and update
         // the name of the variable in that reference.
         for (const conflictId in conflictNamesToReplace) {
diff --git a/src/extension-support/block-type.js b/src/extension-support/block-type.js
index ecaf70754dc..5801d4a1753 100644
--- a/src/extension-support/block-type.js
+++ b/src/extension-support/block-type.js
@@ -14,7 +14,7 @@ const BlockType = {
     BUTTON: 'button',
 
     /**
-     * A text label (not an actual block) for adding comments or labling blocks
+     * A text label (not an actual block) for adding comments or labeling blocks
      */
     LABEL: 'label',
 
diff --git a/src/extensions/scratch3_ev3/index.js b/src/extensions/scratch3_ev3/index.js
index 99255bc2bcf..6ad947aaf37 100644
--- a/src/extensions/scratch3_ev3/index.js
+++ b/src/extensions/scratch3_ev3/index.js
@@ -676,7 +676,7 @@ class EV3 {
     }
 
     /**
-     * Genrates direct commands that are sent to the EV3 as a single or compounded byte arrays.
+     * Generates direct commands that are sent to the EV3 as a single or compounded byte arrays.
      * See 'EV3 Communication Developer Kit', section 4, page 24 at
      * https://education.lego.com/en-us/support/mindstorms-ev3/developer-kits.
      *
@@ -819,7 +819,7 @@ class EV3 {
      * Byte 0 – 1: Reply size, Little Endian. Reply size not including these 2 bytes
      * Byte 2 – 3: Message counter, Little Endian. Equals the Direct Command
      * Byte 4:     Reply type. Either DIRECT_REPLY or DIRECT_REPLY_ERROR
-     * Byte 5 - n: Resonse buffer. I.e. the content of the by the Command reserved global variables.
+     * Byte 5 - n: Response buffer. I.e. the content of the by the Command reserved global variables.
      *             I.e. if the command reserved 64 bytes, these bytes will be placed in the reply
      *             packet as the bytes 5 to 68.
      *
diff --git a/src/extensions/scratch3_gdx_for/index.js b/src/extensions/scratch3_gdx_for/index.js
index 64bfae8f00a..342835668e2 100644
--- a/src/extensions/scratch3_gdx_for/index.js
+++ b/src/extensions/scratch3_gdx_for/index.js
@@ -834,7 +834,7 @@ class Scratch3GdxForBlocks {
         }
 
         // If the sensor is already facing up or down, reduce the threshold.
-        // This prevents small fluctations in acceleration while it is being
+        // This prevents small fluctuations in acceleration while it is being
         // turned from causing the hat block to trigger multiple times.
         let threshold = FACING_THRESHOLD;
         if (this._facingUp || this._facingDown) {
diff --git a/src/extensions/scratch3_microbit/index.js b/src/extensions/scratch3_microbit/index.js
index 1d1ddc3925b..b057df10551 100644
--- a/src/extensions/scratch3_microbit/index.js
+++ b/src/extensions/scratch3_microbit/index.js
@@ -57,7 +57,7 @@ const BLEUUID = {
 };
 
 /**
- * Manage communication with a MicroBit peripheral over a Scrath Link client socket.
+ * Manage communication with a MicroBit peripheral over a Scratch Link client socket.
  */
 class MicroBit {
 
diff --git a/src/extensions/scratch3_music/index.js b/src/extensions/scratch3_music/index.js
index 5a4b226f4c5..445e9640963 100644
--- a/src/extensions/scratch3_music/index.js
+++ b/src/extensions/scratch3_music/index.js
@@ -1188,7 +1188,7 @@ class Scratch3MusicBlocks {
     }
 
     /**
-     * Calcuate the frequency ratio for a given musical interval.
+     * Calculate the frequency ratio for a given musical interval.
      * @param  {number} interval - the pitch interval to convert.
      * @return {number} a ratio corresponding to the input interval.
      * @private
diff --git a/src/extensions/scratch3_pen/index.js b/src/extensions/scratch3_pen/index.js
index 496c7a5b2ac..43fd08bb84e 100644
--- a/src/extensions/scratch3_pen/index.js
+++ b/src/extensions/scratch3_pen/index.js
@@ -659,7 +659,7 @@ class Scratch3PenBlocks {
 
     /**
      * The "change pen {ColorParam} by {number}" block changes one of the pen's color parameters
-     * by a given amound.
+     * by a given amount.
      * @param {object} args - the block arguments.
      *  @property {ColorParam} COLOR_PARAM - the name of the selected color parameter.
      *  @property {number} VALUE - the amount to change the selected parameter by.
@@ -672,7 +672,7 @@ class Scratch3PenBlocks {
 
     /**
      * The "set pen {ColorParam} to {number}" block sets one of the pen's color parameters
-     * to a given amound.
+     * to a given amount.
      * @param {object} args - the block arguments.
      *  @property {ColorParam} COLOR_PARAM - the name of the selected color parameter.
      *  @property {number} VALUE - the amount to set the selected parameter to.
@@ -713,7 +713,7 @@ class Scratch3PenBlocks {
 
     /* LEGACY OPCODES */
     /**
-     * Scratch 2 "hue" param is equivelant to twice the new "color" param.
+     * Scratch 2 "hue" param is equivalent to twice the new "color" param.
      * @param {object} args - the block arguments.
      *  @property {number} HUE - the amount to set the hue to.
      * @param {object} util - utility object provided by the runtime.
@@ -730,7 +730,7 @@ class Scratch3PenBlocks {
     }
 
     /**
-     * Scratch 2 "hue" param is equivelant to twice the new "color" param.
+     * Scratch 2 "hue" param is equivalent to twice the new "color" param.
      * @param {object} args - the block arguments.
      *  @property {number} HUE - the amount of desired hue change.
      * @param {object} util - utility object provided by the runtime.
diff --git a/src/extensions/scratch3_speech2text/index.js b/src/extensions/scratch3_speech2text/index.js
index 79b5ac1e012..0d1a12266fd 100644
--- a/src/extensions/scratch3_speech2text/index.js
+++ b/src/extensions/scratch3_speech2text/index.js
@@ -87,7 +87,7 @@ class Scratch3Speech2TextBlocks {
          * The list of queued `resolve` callbacks for 'Listen and Wait' blocks.
          * We only listen to for one utterance at a time.  We may encounter multiple
          * 'Listen and wait' blocks that tell us to start listening. If one starts
-         * and hasn't receieved results back yet, when we encounter more, any further ones
+         * and hasn't received results back yet, when we encounter more, any further ones
          * will all resolve when we get the next acceptable transcription result back.
          * @type {!Array}
          * @private
@@ -119,7 +119,7 @@ class Scratch3Speech2TextBlocks {
 
         /**
          * The socket used to communicate with the speech server to send microphone data
-         * and recieve transcription results.
+         * and receive transcription results.
          * @type {WebSocket}
          * @private
          */
@@ -289,7 +289,7 @@ class Scratch3Speech2TextBlocks {
     }
 
     /**
-     * Decides whether to keep a given transcirption result.
+     * Decides whether to keep a given transcription result.
      * @param {number} fuzzyMatchIndex Index of the fuzzy match or -1 if there is no match.
      * @param {object} result The json object representing the transcription result.
      * @param {string} normalizedTranscript The transcription text used for matching (i.e. lowercased, no punctuation).
@@ -336,7 +336,7 @@ class Scratch3Speech2TextBlocks {
 
     /**
      * Normalizes text a bit to facilitate matching.  Lowercases, removes some punctuation and whitespace.
-     * @param {string} text The text to normalzie
+     * @param {string} text The text to normalize
      * @returns {string} The normalized text.
      * @private
      */
@@ -391,10 +391,10 @@ class Scratch3Speech2TextBlocks {
         }
 
         this._currentUtterance = transcriptionResult;
-        log.info(`Keeing result: ${this._currentUtterance}`);
+        log.info(`Keeping result: ${this._currentUtterance}`);
         this._utteranceForEdgeTrigger = transcriptionResult;
 
-        // We're done listening so resolove all the promises and reset everying so we're ready for next time.
+        // We're done listening so resolve all the promises and reset everything so we're ready for next time.
         this._resetListening();
 
         // We got results so clear out the timeouts.
@@ -504,7 +504,7 @@ class Scratch3Speech2TextBlocks {
 
     /**
      * Callback called when it is time to setup the new web socket.
-     * @param {Function} resolve - function to call when the web socket opens succesfully.
+     * @param {Function} resolve - function to call when the web socket opens successfully.
      * @param {Function} reject - function to call if opening the web socket fails.
      */
     _newSocketCallback (resolve, reject) {
@@ -691,7 +691,7 @@ class Scratch3Speech2TextBlocks {
 
     /**
      * Reporter for the last heard phrase/utterance.
-     * @return {string} The lastest thing we heard from a listen and wait block.
+     * @return {string} The latest thing we heard from a listen and wait block.
      */
     getSpeech () {
         return this._currentUtterance;
diff --git a/src/extensions/scratch3_translate/index.js b/src/extensions/scratch3_translate/index.js
index 3fe4e022a0c..5dee7d791a6 100644
--- a/src/extensions/scratch3_translate/index.js
+++ b/src/extensions/scratch3_translate/index.js
@@ -139,7 +139,7 @@ class Scratch3TranslateBlocks {
                     text: formatMessage({
                         id: 'translate.viewerLanguage',
                         default: 'language',
-                        description: 'the languge of the project viewer'
+                        description: 'the language of the project viewer'
                     }),
                     blockType: BlockType.REPORTER,
                     arguments: {}
@@ -157,7 +157,7 @@ class Scratch3TranslateBlocks {
     /**
      * Computes a list of language code and name pairs for the given language.
      * @param {string} code The language code to get the list of language pairs
-     * @return {Array.<object.<string, string>>} An array of languge name and
+     * @return {Array.<object.<string, string>>} An array of language name and
      *   language code pairs.
      * @private
      */
@@ -176,7 +176,7 @@ class Scratch3TranslateBlocks {
         const names = languageNames.menuMap[this._viewerLanguageCode];
         let langNameObj = names.find(obj => obj.code === this._viewerLanguageCode);
 
-        // If we don't have a name entry yet, try looking it up via the Google langauge
+        // If we don't have a name entry yet, try looking it up via the Google language
         // code instead of Scratch's (e.g. for es-419 we look up es to get espanol)
         if (!langNameObj && languageNames.scratchToGoogleMap[this._viewerLanguageCode]) {
             const lookupCode = languageNames.scratchToGoogleMap[this._viewerLanguageCode];
diff --git a/src/extensions/scratch3_video_sensing/index.js b/src/extensions/scratch3_video_sensing/index.js
index 3940043c06c..f7e9f583cce 100644
--- a/src/extensions/scratch3_video_sensing/index.js
+++ b/src/extensions/scratch3_video_sensing/index.js
@@ -45,7 +45,7 @@ const SensingSubject = {
     /** The sensor traits of the whole stage. */
     STAGE: 'Stage',
 
-    /** The senosr traits of the area overlapped by this sprite. */
+    /** The sensor traits of the area overlapped by this sprite. */
     SPRITE: 'this sprite'
 };
 
@@ -79,7 +79,7 @@ class Scratch3VideoSensingBlocks {
         this.runtime = runtime;
 
         /**
-         * The motion detection algoritm used to power the motion amount and
+         * The motion detection algorithm used to power the motion amount and
          * direction values.
          * @type {VideoMotion}
          */
diff --git a/src/extensions/scratch3_video_sensing/library.js b/src/extensions/scratch3_video_sensing/library.js
index 6de24214212..6be40003e7f 100644
--- a/src/extensions/scratch3_video_sensing/library.js
+++ b/src/extensions/scratch3_video_sensing/library.js
@@ -243,7 +243,7 @@ class VideoMotion {
                     }
                 }
 
-                // Use the accumalated values from the for loop to determine a
+                // Use the accumulated values from the for loop to determine a
                 // motion direction.
                 const {u, v} = motionVector(A2, A1B2, B1, C2, C1);
 
@@ -349,7 +349,7 @@ class VideoMotion {
                 }
             }
 
-            // Use the accumalated values from the for loop to determine a
+            // Use the accumulated values from the for loop to determine a
             // motion direction.
             let {u, v} = motionVector(A2, A1B2, B1, C2, C1);
 
diff --git a/src/extensions/scratch3_video_sensing/view.js b/src/extensions/scratch3_video_sensing/view.js
index 35623a651c6..e52b0ee84d6 100644
--- a/src/extensions/scratch3_video_sensing/view.js
+++ b/src/extensions/scratch3_video_sensing/view.js
@@ -90,7 +90,7 @@ const OUTPUT = {
 
     /**
      * Render the horizontal pixel difference times the temporal difference as
-     * red and the vertical and temporal difference as green. Multiplcation of
+     * red and the vertical and temporal difference as green. Multiplication of
      * these values ends up with sharp differences in the output showing edge
      * details where motion is happening.
      * @type {number}
@@ -121,7 +121,7 @@ const OUTPUT = {
     UV: 10,
 
     /**
-     * Render cells of mulitple pixels at a step in the motion code that has
+     * Render cells of multiple pixels at a step in the motion code that has
      * the same cell values and turns them into motion vectors showing the
      * amount of motion in the x axis and y axis separately. Those values are a
      * step away from becoming a motion amount and direction through standard
@@ -198,7 +198,7 @@ class VideoMotionView {
      * Iterate each pixel address location and call a function with that address.
      * @param {number} xStart - start location on the x axis of the output pixel buffer
      * @param {number} yStart - start location on the y axis of the output pixel buffer
-     * @param {nubmer} xStop - location to stop at on the x axis
+     * @param {number} xStop - location to stop at on the x axis
      * @param {number} yStop - location to stop at on the y axis
      * @param {function} fn - handle to call with each iterated address
      */
@@ -215,7 +215,7 @@ class VideoMotionView {
      * Iterate over cells of pixels and call a function with a function to
      * iterate over pixel addresses.
      * @param {number} xStart - start location on the x axis
-     * @param {number} yStart - start lcoation on the y axis
+     * @param {number} yStart - start location on the y axis
      * @param {number} xStop - location to stop at on the x axis
      * @param {number} yStop - location to stop at on the y axis
      * @param {number} xStep - width of the cells
diff --git a/src/io/cloud.js b/src/io/cloud.js
index 86e64ed79ee..8e201151da0 100644
--- a/src/io/cloud.js
+++ b/src/io/cloud.js
@@ -35,13 +35,13 @@ class Cloud {
 
     /**
      * Cloud IO Device responsible for sending and receiving messages from
-     * cloud provider (mananging the cloud server connection) and interacting
+     * cloud provider (managing the cloud server connection) and interacting
      * with cloud variables in the current project.
      * @param {Runtime} runtime The runtime context for this cloud io device.
      */
     constructor (runtime) {
         /**
-         * Reference to the cloud data provider, responsible for mananging
+         * Reference to the cloud data provider, responsible for managing
          * the web socket connection to the cloud data server.
          * @type {?CloudProvider}
          */
diff --git a/src/io/video.js b/src/io/video.js
index 65453e3be2b..18d349bffa5 100644
--- a/src/io/video.js
+++ b/src/io/video.js
@@ -102,7 +102,7 @@ class Video {
      *
      * @param {object} frameInfo A descriptor of the frame you would like to receive.
      * @param {Array.<number>} frameInfo.dimensions [width, height] array of numbers.  Defaults to [480,360]
-     * @param {boolean} frameInfo.mirror If you specificly want a mirror/non-mirror frame, defaults to the global
+     * @param {boolean} frameInfo.mirror If you specifically want a mirror/non-mirror frame, defaults to the global
      *                                   mirror state (ioDevices.video.mirror)
      * @param {string} frameInfo.format Requested video format, available formats are 'image-data' and 'canvas'.
      * @param {number} frameInfo.cacheTimeout Will reuse previous image data if the time since capture is less than
diff --git a/src/playground/benchmark.js b/src/playground/benchmark.js
index 85da6b49257..bfbbeddcb0a 100644
--- a/src/playground/benchmark.js
+++ b/src/playground/benchmark.js
@@ -1,6 +1,6 @@
 // Track loading time with timestamps and if possible the performance api.
 if (window.performance) {
-    // Mark with the performance API when benchmark.js and its dependecies start
+    // Mark with the performance API when benchmark.js and its dependencies start
     // evaluation. This can tell us once measured how long the code spends time
     // turning into execution code for the first time. Skipping evaluation of
     // some of the code can help us make it faster.
diff --git a/src/serialization/sb2.js b/src/serialization/sb2.js
index 5af4d4ecb8d..62555112119 100644
--- a/src/serialization/sb2.js
+++ b/src/serialization/sb2.js
@@ -161,7 +161,7 @@ const flatten = function (blocks) {
  * or a list of blocks in an argument (e.g., move [pick random...]).
  * @param {Array.<object>} blockList SB2 JSON-format block list.
  * @param {Function} addBroadcastMsg function to update broadcast message name map
- * @param {Function} getVariableId function to retreive a variable's ID based on name
+ * @param {Function} getVariableId function to retrieve a variable's ID based on name
  * @param {ImportedExtensionsInfo} extensions - (in/out) parsed extension information will be stored here.
  * @param {ParseState} parseState - info on the state of parsing beyond the current block.
  * @param {object<int, Comment>} comments - Comments from sb2 project that need to be attached to blocks.
@@ -202,7 +202,7 @@ const parseBlockList = function (blockList, addBroadcastMsg, getVariableId, exte
  * @param {!object} scripts Scripts object from SB2 JSON.
  * @param {!Blocks} blocks Blocks object to load parsed blocks into.
  * @param {Function} addBroadcastMsg function to update broadcast message name map
- * @param {Function} getVariableId function to retreive a variable's ID based on name
+ * @param {Function} getVariableId function to retrieve a variable's ID based on name
  * @param {ImportedExtensionsInfo} extensions - (in/out) parsed extension information will be stored here.
  * @param {object} comments Comments that need to be attached to the blocks that need to be parsed
  */
@@ -379,7 +379,7 @@ const parseMonitorObject = (object, runtime, targets, extensions) => {
         block.id = block.opcode;
     }
 
-    // Block needs a targetId if it is targetting something other than the stage
+    // Block needs a targetId if it is targeting something other than the stage
     block.targetId = target.isStage ? null : target.id;
 
     // Property required for running monitored blocks.
diff --git a/src/serialization/sb3.js b/src/serialization/sb3.js
index 84280a584c0..506b9a01754 100644
--- a/src/serialization/sb3.js
+++ b/src/serialization/sb3.js
@@ -106,7 +106,7 @@ const UPSTREAM_MAX_COMMENT_LENGTH = 8000;
  * or null if the given block is not one of the primitives described above.
  */
 const serializePrimitiveBlock = function (block) {
-    // Returns an array represeting a primitive block or null if not one of
+    // Returns an array representing a primitive block or null if not one of
     // the primitive types above
     if (hasOwnProperty.call(primitiveOpcodeInfoMap, block.opcode)) {
         const primitiveInfo = primitiveOpcodeInfoMap[block.opcode];
@@ -998,7 +998,7 @@ const deserializeFields = function (fields) {
 };
 
 /**
- * Covnert serialized INPUT and FIELD primitives back to hydrated block templates.
+ * Convert serialized INPUT and FIELD primitives back to hydrated block templates.
  * Should be able to deserialize a format that has already been deserialized.  The only
  * "east" path to adding new targets/code requires going through deserialize, so it should
  * work with pre-parsed deserialized blocks.
@@ -1143,7 +1143,7 @@ const fixSporkCompatibility = function (blocks) {
         }
 
         // control_stop used to define a mutation for whether it has a connection below, which is what old
-        // scratch-blocks relies on to determine if there is another conneciton below or not. Spork does not define
+        // scratch-blocks relies on to determine if there is another connection below or not. Spork does not define
         // this mutation and relies only on the STOP_OPTION field. We will generate the mutation if it's missing so
         // that a "stop other scripts in sprite" block doesn't cause the workspace to fail to load.
         case 'control_stop': {
@@ -1475,7 +1475,7 @@ const replaceUnsafeCharsInVariableIds = function (targets) {
         });
     });
 
-    // Replace the IDs in the blocks refrencing variables or lists
+    // Replace the IDs in the blocks referencing variables or lists
     for (const id in allVarRefs) {
         const newId = StringUtil.replaceUnsafeChars(id);
         if (id === newId) continue; // ID was already safe, skip
diff --git a/src/util/math-util.js b/src/util/math-util.js
index bce666b9253..962500d428d 100644
--- a/src/util/math-util.js
+++ b/src/util/math-util.js
@@ -85,7 +85,7 @@ class MathUtil {
      * For instance, (1, 5, 3) will only pick 1, 2, 4, or 5 (with equal
      * probability)
      *
-     * @param {number} lower - The lower bound (inlcusive)
+     * @param {number} lower - The lower bound (inclusive)
      * @param {number} upper - The upper bound (inclusive), such that lower <= upper
      * @param {number} excluded - The number to exclude (MUST be in the range)
      * @return {number} A random integer in the range [lower, upper] that is not "excluded"
diff --git a/src/util/string-util.js b/src/util/string-util.js
index 59550b6b29b..f27edf798a9 100644
--- a/src/util/string-util.js
+++ b/src/util/string-util.js
@@ -89,7 +89,7 @@ class StringUtil {
                 // See #1030
                 unsafe = String(unsafe);
             } else {
-                log.error('Unexpected input recieved in replaceUnsafeChars');
+                log.error('Unexpected input received in replaceUnsafeChars');
                 return unsafe;
             }
         }
diff --git a/src/util/xml-escape.js b/src/util/xml-escape.js
index eebad772f55..29b53d65a6a 100644
--- a/src/util/xml-escape.js
+++ b/src/util/xml-escape.js
@@ -15,7 +15,7 @@ const xmlEscape = function (unsafe) {
             // See #1030
             unsafe = String(unsafe);
         } else {
-            log.error('Unexpected input recieved in replaceUnsafeChars');
+            log.error('Unexpected input received in replaceUnsafeChars');
             return unsafe;
         }
     }
diff --git a/src/virtual-machine.js b/src/virtual-machine.js
index 2cc5d260c73..8a4f3a7d195 100644
--- a/src/virtual-machine.js
+++ b/src/virtual-machine.js
@@ -267,7 +267,7 @@ class VirtualMachine extends EventEmitter {
     }
 
     /**
-     * @deprecated Used by old versions of TurboWarp. Superceded by upstream's quit()
+     * @deprecated Used by old versions of TurboWarp. Superseded by upstream's quit()
      */
     stop () {
         this.quit();
@@ -917,7 +917,7 @@ class VirtualMachine extends EventEmitter {
 
     /**
      * Add a single sb3 sprite.
-     * @param {object} sprite Object rperesenting 3.0 sprite to be added.
+     * @param {object} sprite Object representing 3.0 sprite to be added.
      * @param {?ArrayBuffer} zip Optional zip of assets being referenced by target json
      * @returns {Promise} Promise that resolves after the sprite is added
      */
@@ -1801,7 +1801,7 @@ class VirtualMachine extends EventEmitter {
     }
 
     /**
-     * Reorder the sounds of a target if it exists. Return whether it occured.
+     * Reorder the sounds of a target if it exists. Return whether it occurred.
      * @param {!string} targetId ID of the target which owns the sounds.
      * @param {!number} soundIndex index of the sound to move.
      * @param {!number} newIndex index that the sound should be moved to.