Backed out 4 changesets (bug 1836974) mochitest failures in dom/workers/test/browser_privilegedmozilla_remoteworker.js CLOSED TREE

Backed out changeset 2da6acc9b08d (bug 1836974)
Backed out changeset 9204d672ecd9 (bug 1836974)
Backed out changeset 271e1c767696 (bug 1836974)
Backed out changeset 349fa2acc5f8 (bug 1836974)

browser/base/content/test/performance/browser_startup_content.js

@@ -75,7 +75,6 @@ const intermittently_loaded_scripts = {
 
     // Translations code which may be preffed on.
     "resource://gre/actors/TranslationsChild.sys.mjs",
-    "resource://gre/modules/translation/LanguageDetector.sys.mjs",
     "chrome://global/content/translations/language-id-engine.sys.mjs",
     "resource://gre/modules/ConsoleAPIStorage.sys.mjs", // Logging related.
 

modules/libpref/init/all.js

@@ -3679,13 +3679,6 @@ pref("browser.translations.simulateUnsupportedEngine", false);
 pref("browser.translations.chaos.errors", false);
 pref("browser.translations.chaos.timeoutMS", 0);
 
-// A pref to manage the use of fastText for language detection in Translations.
-// The feature was initially built using fastText, but we are now putting it
-// behind a pref while we investigate some performance improvements.
-// In the meantime, we will use CLD2, which is already available in tree.
-// See https://bugzilla.mozilla.org/show_bug.cgi?id=1836974
-pref("browser.translations.languageDetection.fastText", false);
-
 // When a user cancels this number of authentication dialogs coming from
 // a single web page in a row, all following authentication dialogs will
 // be blocked (automatically canceled) for that page. The counter resets

toolkit/components/translation/LanguageDetector.sys.mjs

@@ -7,20 +7,6 @@ import { clearTimeout, setTimeout } from "resource://gre/modules/Timer.sys.mjs";
 
 const WORKER_URL = "resource://gre/modules/translation/cld-worker.js";
 
-/**
- * The length of the substring to pull from the document's text for language
- * identification.
- *
- * This value should ideally be one that is large enough to yield a confident
- * identification result without being too large or expensive to extract.
- *
- * At this time, this value is not driven by statistical data or analysis.
- *
- * For the moment, while we investigate which language identification library
- * we would like to use, keep this logic in sync with language-id-engine.sys.mjs
- */
-const DOC_TEXT_TO_IDENTIFY_LENGTH = 1024;
-
 export var workerManager = {
   // Since Emscripten can handle heap growth, but not heap shrinkage, we
   // need to refresh the worker after we've processed a particularly large
@@ -164,27 +150,4 @@ export var LanguageDetector = {
 
     return workerManager.detectLanguage(aParams);
   },
-
-  /**
-   * Attempts to determine the language in which the document's content is written.
-   *
-   * For the moment, while we investigate which language identification library
-   * we would like to use, keep this logic in sync with language-id-engine.sys.mjs
-   * @returns {string | null}
-   */
-  async detectLanguageFromDocument(aDocument) {
-    // Grab a selection of text.
-    let encoder = Cu.createDocumentEncoder("text/plain");
-    encoder.init(aDocument, "text/plain", encoder.SkipInvisibleContent);
-    let text = encoder
-      .encodeToStringWithMaxLength(DOC_TEXT_TO_IDENTIFY_LENGTH)
-      .replaceAll("\r", "")
-      .replaceAll("\n", " ");
-
-    const { language, confident } = await workerManager.detectLanguage({
-      text,
-    });
-
-    return confident ? language : null;
-  },
 };

toolkit/components/translations/actors/AboutTranslationsChild.sys.mjs

@@ -13,17 +13,6 @@ XPCOMUtils.defineLazyGetter(lazy, "console", () => {
   });
 });
 
-ChromeUtils.defineESModuleGetters(lazy, {
-  LanguageDetector:
-    "resource://gre/modules/translation/LanguageDetector.sys.mjs",
-});
-
-XPCOMUtils.defineLazyPreferenceGetter(
-  lazy,
-  "useFastTextPref",
-  "browser.translations.languageDetection.fastText"
-);
-
 /**
  * @typedef {import("./TranslationsChild.sys.mjs").LanguageIdEngine} LanguageIdEngine
  * @typedef {import("./TranslationsChild.sys.mjs").TranslationsEngine} TranslationsEngine
@@ -217,7 +206,7 @@ export class AboutTranslationsChild extends JSWindowActorChild {
     }
     return this.#convertToContentPromise(
       this.#getTranslationsChild()
-        .getOrCreateLanguageIdEngine()
+        .createLanguageIdEngine()
         .then(engine => {
           this.languageIdEngine = engine;
         })
@@ -261,7 +250,6 @@ export class AboutTranslationsChild extends JSWindowActorChild {
    * @returns {Promise<{ langTag: string, confidence: number }>}
    */
   AT_identifyLanguage(message) {
-    if (lazy.useFastTextPref) {
     if (!this.languageIdEngine) {
       const { Promise, Error } = this.contentWindow;
       return Promise.reject(
@@ -275,17 +263,6 @@ export class AboutTranslationsChild extends JSWindowActorChild {
         .then(data => Cu.cloneInto(data, this.contentWindow))
     );
   }
-    return this.#convertToContentPromise(
-      lazy.LanguageDetector.detectLanguage(message).then(data =>
-        Cu.cloneInto(
-          // This language detector reports confidence as a boolean instead of
-          // a percentage, so we need to map the confidence to 0.0 or 1.0.
-          { langTag: data.language, confidence: data.confident ? 1.0 : 0.0 },
-          this.contentWindow
-        )
-      )
-    );
-  }
 
   /**
    * @param {string[]} messageBatch

toolkit/components/translations/actors/TranslationsChild.sys.mjs

@@ -8,8 +8,6 @@ ChromeUtils.defineESModuleGetters(lazy, {
     "chrome://global/content/translations/translations-engine.sys.mjs",
   LanguageIdEngine:
     "chrome://global/content/translations/language-id-engine.sys.mjs",
-  LanguageDetector:
-    "resource://gre/modules/translation/LanguageDetector.sys.mjs",
 });
 
 /**
@@ -83,16 +81,11 @@ export class TranslationsChild extends JSWindowActorChild {
         return this.document.documentElement.lang;
       case "Translations:IdentifyLanguage": {
         try {
-          if (data.useFastText) {
           const engine = await this.createLanguageIdEngine();
           if (!engine) {
             return null;
           }
           return engine.identifyLanguageFromDocument(this.document);
-          }
-          return lazy.LanguageDetector.detectLanguageFromDocument(
-            this.document
-          );
         } catch (error) {
           return null;
         }
@@ -151,7 +144,7 @@ export class TranslationsChild extends JSWindowActorChild {
     });
   }
 
-  getOrCreateLanguageIdEngine() {
+  createLanguageIdEngine() {
     return lazy.LanguageIdEngine.getOrCreate(() => {
       if (this.#isPageHidden) {
         throw new Error("The page was already hidden.");

toolkit/components/translations/actors/TranslationsParent.sys.mjs

@@ -99,12 +99,6 @@ XPCOMUtils.defineLazyPreferenceGetter(
   "browser.translations.simulateUnsupportedEngine"
 );
 
-XPCOMUtils.defineLazyPreferenceGetter(
-  lazy,
-  "useFastTextPref",
-  "browser.translations.languageDetection.fastText"
-);
-
 // At this time the signatures of the files are not being checked when they are being
 // loaded from disk. This signature check involves hitting the network, and translations
 // are explicitly an offline-capable feature. See Bug 1827265 for re-enabling this
@@ -1677,9 +1671,7 @@ export class TranslationsParent extends JSWindowActorParent {
   }
 
   async queryIdentifyLanguage() {
-    return this.sendQuery("Translations:IdentifyLanguage", {
-      useFastText: lazy.useFastTextPref,
-    }).catch(error => {
+    return this.sendQuery("Translations:IdentifyLanguage").catch(error => {
       if (this.#isDestroyed) {
         // The actor was destroyed while this message was still being resolved.
         return null;

toolkit/components/translations/content/language-id-engine.sys.mjs

@@ -44,9 +44,6 @@ const DOC_LANGUAGE_DETECTION_THRESHOLD = 0.65;
  * identification result without being too large or expensive to extract.
  *
  * At this time, this value is not driven by statistical data or analysis.
- *
- * For the moment, while we investigate which language identification library
- * we would like to use, keep this logic in sync with LanguageDetector.sys.mjs
  */
 const DOC_TEXT_TO_IDENTIFY_LENGTH = 1024;
 
@@ -199,10 +196,6 @@ export class LanguageIdEngine {
   }
 
   /**
-   * Attempts to determine the language in which the document's content is written.
-   *
-   * For the moment, while we investigate which language identification library
-   * we would like to use, keep this logic in sync with LanguageDetector.sys.mjs
    * @returns {string | null}
    */
   async identifyLanguageFromDocument(document) {