Bug 1759504 - Put the text recognition UI behind an experimental feature r=emilio,nordzilla,fluent-reviewers,preferences-reviewers,flod

Differential Revision: https://phabricator.services.mozilla.com/D146829

browser/base/content/nsContextMenu.js

@@ -590,8 +590,11 @@ class nsContextMenu {
     // Copy image location depends on whether we're on an image.
     this.showItem("context-copyimage", this.onImage || showBGImage);
 
-    // Performing text recognition only works on images.
-    this.showItem("context-imagetext", this.onImage);
+    // Performing text recognition only works on images, and if the feature is enabled.
+    this.showItem(
+      "context-imagetext",
+      this.onImage && TEXT_RECOGNITION_ENABLED
+    );
 
     // Send media URL (but not for canvas, since it's a big data: URL)
     this.showItem("context-sendimage", this.onImage || showBGImage);
@@ -2378,3 +2381,10 @@ XPCOMUtils.defineLazyPreferenceGetter(
   "layout.forms.reveal-password-context-menu.enabled",
   false
 );
+
+XPCOMUtils.defineLazyPreferenceGetter(
+  this,
+  "TEXT_RECOGNITION_ENABLED",
+  "dom.text-recognition.enabled",
+  false
+);

modules/libpref/init/all.js

@@ -188,6 +188,9 @@ pref("dom.keyboardevent.keypress.hack.use_legacy_keycode_and_charcode.addl", "")
 // explanation for the detail.
 pref("dom.mouseevent.click.hack.use_legacy_non-primary_dispatch", "");
 
+// Enable experimental text recognition features for supported OSes.
+pref("dom.text-recognition.enabled", false);
+
 // Fastback caching - if this pref is negative, then we calculate the number
 // of content viewers to cache based on the amount of available memory.
 pref("browser.sessionhistory.max_total_viewers", -1);

toolkit/components/featuregates/Features.toml

@@ -122,3 +122,13 @@ type = "boolean"
 bug-numbers = [1673971]
 is-public = true
 default-value = false
+
+[text-recognition]
+title = "experimental-features-text-recognition"
+description = "experimental-features-text-recognition-description"
+preference = "dom.text-recognition.enabled"
+restart-required = false
+type = "boolean"
+bug-numbers = [1759199]
+is-public = {default = false, "nightly,mac" = true}
+default-value = false

toolkit/locales/en-US/toolkit/featuregates/features.ftl

@@ -72,3 +72,8 @@ experimental-features-js-warp-description = Enable Warp, a project to improve Ja
 experimental-features-ime-search =
     .label = Address Bar: show results during IME composition
 experimental-features-ime-search-description = An IME (Input Method Editor) is a tool that allows you to enter complex symbols, such as those used in East Asian or Indic written languages, using a standard keyboard. Enabling this experiment will keep the address bar panel open, showing search results and suggestions, while using IME to input text. Note that the IME might display a panel that covers the address bar results, therefore this preference is only suggested for IME not using this type of panel.
+
+# Text recognition for images
+experimental-features-text-recognition =
+    .label = Text Recognition
+experimental-features-text-recognition-description = Enable features to recognize text in images.