Bug 1975002: Ensure we fully decode images before trying to use them in the Dock or Taskbar. r=profiles-reviewers,niklas
Differential Revision:
https://phabricator.services.mozilla.com/D256996
<!doctype html>
<title>no targetOrigin</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
async_test(function() {
postMessage('', {});
onmessage = this.step_func(function(e) {
assert_equals(e.data, '');
this.done();
});
});
</script>
