1414783 - window object in content script of WebExtension is reset if document.domain is set explicitly

Status: RESOLVED DUPLICATE of bug 1408996

(WebExtensions :: General, defect)

Description

[gera2ld]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.75 Safari/537.36

Steps to reproduce:

1. create an HTML file with script below in it, let's say `test.html`:
```js
<script>
// document.domain = 'parent.domain';

// or even this will cause the issue
document.domain = document.domain;
</script>
```

2. create a WebExtension with content script below:
```js
window.aaa = 1;
const aaa = window.aaa;
setTimeout(() => {
  console.log(aaa, window.aaa);
}, 1000);
```

3. enable the WebExtension, visit the HTML with an HTTP server, local server works (e.g http://localhost:8080/test.html), and see the logs in console.


Actual results:

With `document.domain` set explicitly, I got `1 undefined` in console.
Without that I got `1 1`.


Expected results:

It should always be `1 1`.
By doing a few tests, I found that the window object seems to be reset with all values on it lost. But the window object is still the original object (windowBefore === windowAfter).

Comment 1

[gera2ld]

This can be reproduced in Firefox 56 / 57 / 58.