diff --git a/browser/components/customizableui/CustomizableUI.sys.mjs b/browser/components/customizableui/CustomizableUI.sys.mjs
index 92bb2805ddd7..04e60a96a3ec 100644
--- a/browser/components/customizableui/CustomizableUI.sys.mjs
+++ b/browser/components/customizableui/CustomizableUI.sys.mjs
@@ -5611,6 +5611,7 @@ export var CustomizableUI = {
   /**
    * An iteratable property of windows managed by CustomizableUI.
    * Note that this can *only* be used as an iterator. ie:
+   *
    *     for (let window of CustomizableUI.windows) { ... }
    */
   windows: {
@@ -7488,11 +7489,11 @@ function XULWidgetSingleWrapper(aWidgetId, aNode, aDocument) {
  * There are two panels that toolbar items can be overflowed to:
  *
  * 1. The default items overflow panel
- *   This is where built-in default toolbar items will go to.
+ *    This is where built-in default toolbar items will go to.
  * 2. The Unified Extensions panel
- *   This is where browser_action toolbar buttons created by extensions will
- *   go to if the Unified Extensions UI is enabled - otherwise, those items will
- *   go to the default items overflow panel.
+ *    This is where browser_action toolbar buttons created by extensions will
+ *    go to if the Unified Extensions UI is enabled - otherwise, those items will
+ *    go to the default items overflow panel.
  *
  * Finally, OverflowableToolbar manages the showing of the default items
  * overflow panel when the associated anchor is clicked or dragged over. The
diff --git a/browser/components/customizableui/PanelMultiView.sys.mjs b/browser/components/customizableui/PanelMultiView.sys.mjs
index a556628c69d7..e28b84e4f366 100644
--- a/browser/components/customizableui/PanelMultiView.sys.mjs
+++ b/browser/components/customizableui/PanelMultiView.sys.mjs
@@ -382,7 +382,7 @@ export var PanelMultiView = class extends AssociatedToNode {
    * @memberof PanelMultiView
    * @param {DOMNode} panelNode
    *   The <panel> node that is to be opened.
-   * @param {...*} args
+   * @param {...any} args
    *   Additional arguments to be forwarded to the openPopup method of the
    *   panel.
    * @returns {Promise<boolean, Exception>|boolean}
@@ -627,7 +627,7 @@ export var PanelMultiView = class extends AssociatedToNode {
    * @param {StringOrOpenPopupOptions} options
    *   Either options to use or a string position. This is forwarded to
    *   the openPopup method of the panel.
-   * @param {...*} args
+   * @param {...any} args
    *   Additional arguments to be forwarded to the openPopup method of the
    *   panel.
    * @returns {Promise<boolean, Exception>}
@@ -1699,7 +1699,7 @@ export var PanelView = class extends AssociatedToNode {
    * correct method is called on CustomizableWidget if applicable.
    *
    * @see AssociatedToNode.dispatchCustomEvent
-   * @param {...*} args
+   * @param {...any} args
    *   Additional arguments to be forwarded to the dispatchCustomEvent method of
    *   AssociatedToNode.
    */
@@ -1967,6 +1967,7 @@ export var PanelView = class extends AssociatedToNode {
    * navigate to the previous view, functioning as a shortcut for the view's
    * back button.
    * Thus, in LTR mode:
+   *
    *  - The Right key functions the same as the Enter key, simulating a click
    *  - The Left key triggers a navigation back to the previous view.
    *
diff --git a/browser/components/urlbar/UrlbarPrefs.sys.mjs b/browser/components/urlbar/UrlbarPrefs.sys.mjs
index c0211485ac78..0ea13a2ae37f 100644
--- a/browser/components/urlbar/UrlbarPrefs.sys.mjs
+++ b/browser/components/urlbar/UrlbarPrefs.sys.mjs
@@ -1180,7 +1180,7 @@ class Preferences {
    *
    * @param {string} pref
    *        The name of the preference to get.
-   * @returns {*} The preference value.
+   * @returns {any} The preference value.
    */
   get(pref) {
     let value = this._map.get(pref);
@@ -1199,7 +1199,7 @@ class Preferences {
    *
    * @param {string} pref
    *        The name of the preference to set.
-   * @param {*} value The preference value.
+   * @param {any} value The preference value.
    */
   set(pref, value) {
     let { defaultValue, set } = this._getPrefDescriptor(pref);
@@ -1215,7 +1215,7 @@ class Preferences {
    *
    * @param {string} pref
    *   The name of the preference to set.
-   * @param {*} value
+   * @param {any} value
    *   The preference value.
    */
   add(pref, value) {
@@ -1262,7 +1262,7 @@ class Preferences {
    *
    * @param {string} pref
    *        The name of the preference to clear.
-   * @returns {*} The preference value.
+   * @returns {any} The preference value.
    */
   getScotchBonnetPref(pref) {
     return this.get("scotchBonnet.enableOverride") || this.get(pref);
@@ -1475,7 +1475,7 @@ class Preferences {
    *
    * @param {string} pref
    *        The name of the preference to get.
-   * @returns {*} The raw preference value.
+   * @returns {any} The raw preference value.
    */
   _readPref(pref) {
     let { defaultValue, get } = this._getPrefDescriptor(pref);
@@ -1493,7 +1493,7 @@ class Preferences {
    *
    * @param {string} pref
    *        The name of the preference to get.
-   * @returns {*} The validated and/or fixed-up preference value.
+   * @returns {any} The validated and/or fixed-up preference value.
    */
   _getPrefValue(pref) {
     switch (pref) {
diff --git a/browser/components/urlbar/UrlbarUtils.sys.mjs b/browser/components/urlbar/UrlbarUtils.sys.mjs
index 2edcb3e7058b..50cc68cb0fba 100644
--- a/browser/components/urlbar/UrlbarUtils.sys.mjs
+++ b/browser/components/urlbar/UrlbarUtils.sys.mjs
@@ -1949,8 +1949,8 @@ export class UrlbarProvider {
    * overridden.
    *
    * @param {string} methodName The name of the method to call.
-   * @param {*} args The method arguments.
-   * @returns {*} The return value of the method, or undefined if the method
+   * @param {any} args The method arguments.
+   * @returns {any} The return value of the method, or undefined if the method
    *          throws an error.
    * @abstract
    */
diff --git a/testing/mochitest/tests/SimpleTest/EventUtils.js b/testing/mochitest/tests/SimpleTest/EventUtils.js
index 5bd02bfbcc63..5bc437f999ab 100644
--- a/testing/mochitest/tests/SimpleTest/EventUtils.js
+++ b/testing/mochitest/tests/SimpleTest/EventUtils.js
@@ -1810,7 +1810,7 @@ function synthesizeAndWaitNativeMouseMove(
  * @param {number} [aEvent.repeat]
  *        If you emulate auto-repeat, you should set the count of repeat.
  *        This method will automatically synthesize keydown (and keypress).
- * @param {*} aEvent.location
+ * @param {any} aEvent.location
  *        If you want to specify this, you can specify this explicitly.
  *        However, if you don't specify this value, it will be computed
  *        from code value.
@@ -3468,7 +3468,7 @@ function synthesizeDragOver(
  * Emulate the drop event and mouseup event.
  * This should be called after synthesizeDragOver.
  *
- * @param {*} aResult
+ * @param {any} aResult
  *        The first element of the array returned from ``synthesizeDragOver``.
  * @param {DataTransfer} aDataTransfer
  *        The second element of the array returned from ``synthesizeDragOver``.
diff --git a/testing/modules/Assert.sys.mjs b/testing/modules/Assert.sys.mjs
index 3807f4b6ea09..c6b9f38d5317 100644
--- a/testing/modules/Assert.sys.mjs
+++ b/testing/modules/Assert.sys.mjs
@@ -209,9 +209,9 @@ Assert.prototype.setReporter = function (reporterFunc) {
  *
  * @param {boolean} failed
  *        Indicates if the assertion failed or not.
- * @param {*} actual
+ * @param {any} actual
  *        The result of evaluating the assertion.
- * @param {*} [expected]
+ * @param {any} [expected]
  *        Expected result from the test author.
  * @param {string} [message]
  *        Short explanation of the expected result.
@@ -267,7 +267,7 @@ Assert.prototype.report = function (
  * To test strictly for the value true, use ``assert.strictEqual(true, guard,
  * message_opt);``.
  *
- * @param {*} value
+ * @param {any} value
  *        Test subject to be evaluated as truthy.
  * @param {string} [message]
  *        Short explanation of the expected result.
@@ -290,9 +290,9 @@ Assert.prototype.ok = function (value, message) {
  * 5. The equality assertion tests shallow, coercive equality with ==.
  * ``assert.equal(actual, expected, message_opt);``
  *
- * @param {*} actual
+ * @param {any} actual
  *        Test subject to be evaluated as equivalent to ``expected``.
- * @param {*} expected
+ * @param {any} expected
  *        Test reference to evaluate against ``actual``.
  * @param {string} [message]
  *        Short explanation of the expected result.
@@ -308,9 +308,9 @@ Assert.prototype.equal = function equal(actual, expected, message) {
  * @example
  * assert.notEqual(actual, expected, message_opt);
  *
- * @param {*} actual
+ * @param {any} actual
  *        Test subject to be evaluated as NOT equivalent to ``expected``.
- * @param {*} expected
+ * @param {any} expected
  *        Test reference to evaluate against ``actual``.
  * @param {string} [message]
  *        Short explanation of the expected result.
@@ -328,9 +328,9 @@ Assert.prototype.notEqual = function notEqual(actual, expected, message) {
  * `JSON.stringify` is not designed to be used for this purpose; objects may
  * have ambiguous `toJSON()` implementations that would influence the test.
  *
- * @param {*} actual
+ * @param {any} actual
  *        Test subject to be evaluated as equivalent to ``expected``, including nested properties.
- * @param {*} expected
+ * @param {any} expected
  *        Test reference to evaluate against ``actual``.
  * @param {string} [message]
  *        Short explanation of the expected result.
@@ -350,10 +350,10 @@ Assert.prototype.deepEqual = function deepEqual(actual, expected, message) {
  * 8. The non-equivalence assertion tests for any deep inequality.
  * assert.notDeepEqual(actual, expected, message_opt);
  *
- * @param {*} actual
+ * @param {any} actual
  *        Test subject to be evaluated as NOT equivalent to ``expected``, including nested
  *        properties.
- * @param {*} expected
+ * @param {any} expected
  *        Test reference to evaluate against ``actual``.
  * @param {string} [message]
  *        Short explanation of the expected result.
@@ -377,9 +377,9 @@ Assert.prototype.notDeepEqual = function notDeepEqual(
  * 9. The strict equality assertion tests strict equality, as determined by ===.
  * ``assert.strictEqual(actual, expected, message_opt);``
  *
- * @param {*} actual
+ * @param {any} actual
  *        Test subject to be evaluated as strictly equivalent to ``expected``.
- * @param {*} expected
+ * @param {any} expected
  *        Test reference to evaluate against ``actual``.
  * @param {string} [message]
  *        Short explanation of the expected result.
@@ -392,9 +392,9 @@ Assert.prototype.strictEqual = function strictEqual(actual, expected, message) {
  * 10. The strict non-equality assertion tests for strict inequality, as
  * determined by !==. ``assert.notStrictEqual(actual, expected, message_opt);``
  *
- * @param {*} actual
+ * @param {any} actual
  *        Test subject to be evaluated as NOT strictly equivalent to ``expected``.
- * @param {*} expected
+ * @param {any} expected
  *        Test reference to evaluate against ``actual``.
  * @param {string} [message]
  *        Short explanation of the expected result.
diff --git a/toolkit/actors/PopupAndRedirectBlockingParent.sys.mjs b/toolkit/actors/PopupAndRedirectBlockingParent.sys.mjs
index 168addef8083..1eb64b8ffba8 100644
--- a/toolkit/actors/PopupAndRedirectBlockingParent.sys.mjs
+++ b/toolkit/actors/PopupAndRedirectBlockingParent.sys.mjs
@@ -89,7 +89,7 @@ export class PopupAndRedirectBlocker {
    * Event callback for the notification that is shown when a popup or
    * redirect is blocked. This is used in the observer.
    *
-   * @param {*} reason
+   * @param {any} reason
    */
   eventCallback(reason) {
     if (reason == "dismissed") {
diff --git a/toolkit/components/extensions/ConduitsParent.sys.mjs b/toolkit/components/extensions/ConduitsParent.sys.mjs
index aa42ed150703..5ab6166c7947 100644
--- a/toolkit/components/extensions/ConduitsParent.sys.mjs
+++ b/toolkit/components/extensions/ConduitsParent.sys.mjs
@@ -24,7 +24,7 @@
  * @property {string[]} [query]
  * @property {string[]} [cast]
  *
- * @property {*} [actor]
+ * @property {any} [actor]
  * @property {boolean} [verified]
  * @property {string} [url]
  * @property {number} [frameId]
diff --git a/toolkit/components/extensions/ExtensionCommon.sys.mjs b/toolkit/components/extensions/ExtensionCommon.sys.mjs
index 4e079770534d..6454baad48bc 100644
--- a/toolkit/components/extensions/ExtensionCommon.sys.mjs
+++ b/toolkit/components/extensions/ExtensionCommon.sys.mjs
@@ -823,7 +823,7 @@ export class BaseContext {
    *        The optional caller frame which triggered this callback, to be used
    *        in error reporting.
    * @param {Function} callback The callback to call.
-   * @returns {*} The return value of callback.
+   * @returns {any} The return value of callback.
    */
   withLastError(error, caller, callback) {
     this.lastError = this.normalizeError(error);
@@ -998,7 +998,7 @@ export class SchemaAPIInterface {
    *
    * @abstract
    * @param {Array} _args The parameters for the function.
-   * @returns {*} The return value of the invoked function.
+   * @returns {any} The return value of the invoked function.
    */
   callFunction(_args) {
     throw new Error("Not implemented");
@@ -1034,7 +1034,7 @@ export class SchemaAPIInterface {
    * Retrieves the value of this as a property.
    *
    * @abstract
-   * @returns {*} The value of the property.
+   * @returns {any} The value of the property.
    */
   getProperty() {
     throw new Error("Not implemented");
@@ -1311,7 +1311,7 @@ class CanOfAPIs {
    *
    * @param {string} path
    *        The "."-separated path to find.
-   * @returns {*}
+   * @returns {any}
    */
   findAPIPath(path) {
     if (this.apiPaths.has(path)) {
@@ -1581,7 +1581,7 @@ class SchemaAPIManager extends EventEmitter {
    * @param {string} entry
    *        The name of the top-level manifest entry.
    *
-   * @returns {*}
+   * @returns {any}
    */
   emitManifestEntry(extension, entry) {
     let apiName = this.manifestKeys.get(entry);
diff --git a/toolkit/components/extensions/ExtensionStorage.sys.mjs b/toolkit/components/extensions/ExtensionStorage.sys.mjs
index 9d4bd140aa2b..1262f6f17b3c 100644
--- a/toolkit/components/extensions/ExtensionStorage.sys.mjs
+++ b/toolkit/components/extensions/ExtensionStorage.sys.mjs
@@ -80,7 +80,7 @@ class SerializeableMap extends Map {
  *        reports. If `null`, then `name` will be used instead.
  * @param {StructuredCloneHolder|*} value
  *        A value to serialize.
- * @returns {*}
+ * @returns {any}
  */
 function serialize(name, anonymizedName, value) {
   if (value && typeof value === "object" && !isStructuredCloneHolder(value)) {
diff --git a/toolkit/components/extensions/NativeMessaging.sys.mjs b/toolkit/components/extensions/NativeMessaging.sys.mjs
index 32aa4dc52671..89eb1ac96e51 100644
--- a/toolkit/components/extensions/NativeMessaging.sys.mjs
+++ b/toolkit/components/extensions/NativeMessaging.sys.mjs
@@ -224,7 +224,7 @@ export class NativeApp extends EventEmitter {
 
   /**
    * @param {BaseContext} context The scope from where `message` originates.
-   * @param {*} message A message from the extension, meant for a native app.
+   * @param {any} message A message from the extension, meant for a native app.
    * @returns {ArrayBufferLike} An ArrayBuffer that can be sent to the native app.
    */
   static encodeMessage(context, message) {
diff --git a/toolkit/components/extensions/Schemas.sys.mjs b/toolkit/components/extensions/Schemas.sys.mjs
index 294189e896ef..093b045bd3b4 100644
--- a/toolkit/components/extensions/Schemas.sys.mjs
+++ b/toolkit/components/extensions/Schemas.sys.mjs
@@ -765,7 +765,7 @@ class Context {
    *
    * @param {string} component
    * @param {Function} callback
-   * @returns {*}
+   * @returns {any}
    */
   withPath(component, callback) {
     this.path.push(component);
@@ -1464,9 +1464,9 @@ class Entry {
    * Preprocess the given value with the preprocessor declared in
    * `preprocessor`.
    *
-   * @param {*} value
+   * @param {any} value
    * @param {Context} context
-   * @returns {*}
+   * @returns {any}
    */
   preprocess(value, context) {
     if (this.preprocessor) {
diff --git a/toolkit/components/extensions/parent/ext-tabs-base.js b/toolkit/components/extensions/parent/ext-tabs-base.js
index 99c6f5572913..522a443d669a 100644
--- a/toolkit/components/extensions/parent/ext-tabs-base.js
+++ b/toolkit/components/extensions/parent/ext-tabs-base.js
@@ -1480,7 +1480,7 @@ class TabTrackerBase extends EventEmitter {
    *
    * @param {integer} _tabId
    *        The numeric ID of the tab to return.
-   * @param {*} _default
+   * @param {any} _default
    *        The value to return if no tab exists with the given ID.
    *
    * @returns {NativeTab}
@@ -2420,7 +2420,7 @@ class WindowManagerBase {
    *
    * @param {DOMWindow} window
    *        The browser window to convert.
-   * @param {*} args
+   * @param {any} args
    *        Additional arguments to be passed to {@link WindowBase#convert}.
    *
    * @returns {object}
diff --git a/toolkit/components/ml/content/backends/ONNXPipeline.mjs b/toolkit/components/ml/content/backends/ONNXPipeline.mjs
index 533a7e162b13..a5e658332f7a 100644
--- a/toolkit/components/ml/content/backends/ONNXPipeline.mjs
+++ b/toolkit/components/ml/content/backends/ONNXPipeline.mjs
@@ -622,7 +622,7 @@ export class ONNXPipeline {
    *
    * @param {object} mlEngineWorker - Implements the Cache interface and used to get models
    * @param {object} config - The configuration options
-   * @param {*} errorFactory - error class passed by the backend factory.
+   * @param {any} errorFactory - error class passed by the backend factory.
    */
   constructor(mlEngineWorker, config, errorFactory) {
     this.#errorFactory = errorFactory;
@@ -794,7 +794,7 @@ export class ONNXPipeline {
    * @param {object} mlEngineWorker - Implements the Cache interface and used to get models
    * @param {ArrayBuffer} runtime - The runtime wasm file.
    * @param {PipelineOptions} options - The options for initialization.
-   * @param {*} errorFactory - error class passed by the backend factory.
+   * @param {any} errorFactory - error class passed by the backend factory.
    * @returns {Promise<Pipeline>} The initialized pipeline instance.
    */
   static async initialize(mlEngineWorker, runtime, options, errorFactory) {