1 files changed, 36 insertions, 0 deletions
diff --git a/browser/components/preferences/tests/browser_layersacceleration.js b/browser/components/preferences/tests/browser_layersacceleration.js
new file mode 100644
index 0000000000..982a32c94d
--- /dev/null
+++ b/browser/components/preferences/tests/browser_layersacceleration.js
@@ -0,0 +1,36 @@
+add_task(async function () {
+  // We must temporarily disable `Once` StaticPrefs check for the duration of
+  // this test (see bug 1556131). We must do so in a separate operation as
+  // pushPrefEnv doesn't set the preferences in the order one could expect.
+  await SpecialPowers.pushPrefEnv({
+    set: [["preferences.force-disable.check.once.policy", true]],
+  });
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["gfx.direct2d.disabled", false],
+      ["layers.acceleration.disabled", false],
+    ],
+  });
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let checkbox = doc.querySelector("#allowHWAccel");
+  is(
+    !checkbox.checked,
+    Services.prefs.getBoolPref("layers.acceleration.disabled"),
+    "checkbox should represent inverted pref value before clicking on checkbox"
+  );
+
+  checkbox.click();
+
+  is(
+    !checkbox.checked,
+    Services.prefs.getBoolPref("layers.acceleration.disabled"),
+    "checkbox should represent inverted pref value after clicking on checkbox"
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});