"use strict"; add_task(async function test_alpha_frame_color() { let extension = ExtensionTestUtils.loadExtension({ manifest: { theme: { images: { theme_frame: "image1.png", }, colors: { frame: "rgba(230, 128, 0, 0.1)", tab_background_text: TEXT_COLOR, }, }, }, files: { "image1.png": BACKGROUND, }, }); await extension.startup(); Assert.equal( getToolboxBackgroundColor(), "rgb(230, 128, 0)", "Window background color should be opaque" ); await extension.unload(); });