1 files changed, 69 insertions, 0 deletions
diff --git a/toolkit/components/extensions/test/browser/browser_ext_themes_lwtsupport.js b/toolkit/components/extensions/test/browser/browser_ext_themes_lwtsupport.js
new file mode 100644
index 0000000000..4293e5eb19
--- /dev/null
+++ b/toolkit/components/extensions/test/browser/browser_ext_themes_lwtsupport.js
@@ -0,0 +1,69 @@
+"use strict";
+
+const DEFAULT_THEME_BG_COLOR = "rgb(255, 255, 255)";
+const DEFAULT_THEME_TEXT_COLOR = "rgb(0, 0, 0)";
+
+add_task(async function test_deprecated_LWT_properties_ignored() {
+  // This test uses deprecated theme properties, so warnings are expected.
+  ExtensionTestUtils.failOnSchemaWarnings(false);
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      theme: {
+        images: {
+          headerURL: "image1.png",
+        },
+        colors: {
+          accentcolor: ACCENT_COLOR,
+          textcolor: TEXT_COLOR,
+        },
+      },
+    },
+    files: {
+      "image1.png": BACKGROUND,
+    },
+  });
+
+  await extension.startup();
+
+  let docEl = window.document.documentElement;
+  let docStyle = window.getComputedStyle(docEl);
+  let navigatorStyle = window.getComputedStyle(
+    docEl.querySelector("#navigator-toolbox")
+  );
+
+  Assert.ok(docEl.hasAttribute("lwtheme"), "LWT attribute should be set");
+  Assert.ok(
+    !docEl.hasAttribute("lwtheme-image"),
+    "LWT image attribute should not be set on deprecated headerURL alias"
+  );
+  Assert.ok(
+    !docEl.getAttribute("lwtheme-brighttext"),
+    "LWT text color attribute should not be set on deprecated textcolor alias"
+  );
+
+  if (backgroundColorSetOnRoot()) {
+    let rootCS = window.getComputedStyle(docEl);
+    Assert.equal(
+      rootCS.backgroundColor,
+      DEFAULT_THEME_BG_COLOR,
+      "Expected default theme background color"
+    );
+  } else {
+    Assert.equal(
+      navigatorStyle.backgroundColor,
+      DEFAULT_THEME_BG_COLOR,
+      "Expected default theme background color"
+    );
+  }
+
+  Assert.equal(
+    docStyle.color,
+    DEFAULT_THEME_TEXT_COLOR,
+    "Expected default theme text color"
+  );
+
+  await extension.unload();
+
+  Assert.ok(!docEl.hasAttribute("lwtheme"), "LWT attribute should not be set");
+});