Bug 1767846 - Remove MSU Reader Mode improvements pref. r=mtigley

Differential Revision: https://phabricator.services.mozilla.com/D148063

modules/libpref/init/all.js

@@ -4033,9 +4033,6 @@ pref("reader.has_used_toolbar", false);
 // Whether to use a vertical or horizontal toolbar.
 pref("reader.toolbar.vertical", true);
 
-// Whether or not we display additional UI (such as the full screen, reset to default, and browser theme buttons).
-pref("reader.improvements_H12022.enabled", false);
-
 #if !defined(ANDROID)
   pref("narrate.enabled", true);
 #else

toolkit/components/reader/AboutReader.jsm

@@ -176,23 +176,6 @@ var AboutReader = function(
   });
   let colorScheme = Services.prefs.getCharPref("reader.color_scheme");
 
-  // If the UI improvements are not enabled, we will filter "Auto" from
-  // the list of color schemes available and ensure the current preference isn't set to
-  // "Auto"
-  this.readerImprovementsEnabled = Services.prefs.getBoolPref(
-    "reader.improvements_H12022.enabled",
-    false
-  );
-  if (!this.readerImprovementsEnabled) {
-    colorSchemeOptions = colorSchemeOptions.filter(function(value) {
-      return value.name !== "Auto";
-    });
-
-    if (Services.prefs.getCharPref("reader.color_scheme") === "auto") {
-      colorScheme = "light";
-    }
-  }
-
   this._setupSegmentedButton(
     "color-scheme-buttons",
     colorSchemeOptions,

toolkit/components/reader/test/browser_readerMode_colorSchemePref.js

@@ -10,11 +10,6 @@ const TEST_PATH = getRootDirectory(gTestPath).replace(
 );
 
 async function testColorScheme(aPref, aExpectation) {
-  // Enable this preference so we can test the new behavior for the color scheme.
-  await SpecialPowers.pushPrefEnv({
-    set: [["reader.improvements_H12022.enabled", true]],
-  });
-
   // Set the browser content theme to light or dark.
   Services.prefs.setIntPref("browser.theme.content-theme", aPref);
 

toolkit/components/reader/test/browser_readerMode_pocket.js

@@ -93,9 +93,6 @@ add_task(async function() {
  * Test that the pocket button toggles the pocket popup successfully
  */
 add_task(async function() {
-  await SpecialPowers.pushPrefEnv({
-    set: [["reader.improvements_H12022.enabled", true]],
-  });
   await BrowserTestUtils.withNewTab(
     TEST_PATH + "readerModeArticleShort.html",
     async function(browser) {