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Test Info:

<title>Test for background page canvas rendering</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
<script type="text/javascript" src="head.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<script type="text/javascript">
"use strict";
add_task(async function test_background_canvas() {
function background() {
try {
let canvas = document.createElement("canvas");
let context = canvas.getContext("2d");
// This ensures that we have a working PresShell, and can successfully
// calculate font metrics.
context.font = "8pt fixed";
} catch (e) {`Error: ${e} :: ${e.stack}`);
let extension = ExtensionTestUtils.loadExtension({ background });
await extension.startup();
await extension.awaitFinish("background-canvas");
await extension.unload();