test_ua_sheet_disable.html

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<!DOCTYPE html>

<title>Test for bug 1534399</title>

<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>

<script>

function start() {

  let sheet = InspectorUtils.getAllStyleSheets(document, false)[0];

  ok(sheet.href.indexOf("test.css") == -1, "Shouldn't have found the author sheet");

  is(sheet.disabled, false, "Sheet should initially be enabled");

  sheet.disabled = true;

  is(sheet.disabled, false, "Shouldn't be able to disable a UA sheet");

  SimpleTest.finish();

SimpleTest.waitForExplicitFinish();

document.addEventListener('DOMContentLoaded', start)

</script>