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Test Info:
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Test captureVisibleTab blurring for extension pages</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
<script type="text/javascript" src="head.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<script type="text/javascript">
"use strict";
// Verify that an extension cannot capture another extension's page at full
// quality, but can capture its own pages without blurring.
add_task(async function test_captureVisibleTab_extension_pages() {
let victimExtension = ExtensionTestUtils.loadExtension({
files: {
"page.html": `<!DOCTYPE html><html><body>victim extension page</body></html>`,
},
async background() {
let tab = await browser.tabs.create({
url: browser.runtime.getURL("page.html"),
active: true,
});
browser.test.sendMessage("ready");
await new Promise(resolve => browser.test.onMessage.addListener(resolve));
await browser.tabs.remove(tab.id);
browser.test.sendMessage("closed");
},
});
await victimExtension.startup();
await victimExtension.awaitMessage("ready");
let extension = ExtensionTestUtils.loadExtension({
manifest: { permissions: ["<all_urls>"] },
files: {
"page.html": `<!DOCTYPE html><html><body>own extension page</body></html>`,
},
async background() {
// Capture the active tab (victim extension's page) — should be blurred.
let blurred = await browser.tabs.captureVisibleTab();
browser.test.assertTrue(
blurred.startsWith("data:image/png;"),
"Other extension's page returns PNG by default (blurred)"
);
let blurredImg = new Image();
blurredImg.src = blurred;
await blurredImg.decode();
browser.test.assertTrue(
blurredImg.width <= 300,
`Blurred image width ${blurredImg.width} is at most 300`
);
browser.test.assertTrue(
blurredImg.height <= 300,
`Blurred image height ${blurredImg.height} is at most 300`
);
// Open own page and capture — should NOT be blurred.
let ownTab = await browser.tabs.create({
url: browser.runtime.getURL("page.html"),
active: true,
});
let unblurred = await browser.tabs.captureVisibleTab();
browser.test.assertTrue(
unblurred.startsWith("data:image/png;"),
"Own extension page capture returns PNG"
);
let unblurredImg = new Image();
unblurredImg.src = unblurred;
await unblurredImg.decode();
browser.test.assertTrue(
unblurredImg.width > 300 || unblurredImg.height > 300,
`Own extension page (${unblurredImg.width}x${unblurredImg.height}) is not blurred`
);
await browser.tabs.remove(ownTab.id);
browser.test.sendMessage("done");
},
});
await extension.startup();
await extension.awaitMessage("done");
await extension.unload();
victimExtension.sendMessage("cleanup");
await victimExtension.awaitMessage("closed");
await victimExtension.unload();
});
</script>
</body>
</html>