This extension is intended for advanced users. Some websites will require configuration to work properly. For each website, you can decide from which domains JavaScript is allowed. By default, only scripts from the same domain than the website are allowed. Interface

The table shows how many requests have been blocked or allowed on the web page for each domain. Each column of the table represents a type of request:
- JS: javascript code: <script> and Workers
- XHR: data request: XMLHttpRequest, Fetch, WebSocket, Beacon, ping, and Content-Security-Policy-report
- FRAME: external content: <iframe>, <frame>, <object> and <embed>
The color of a cell indicates whether it has been blocked or allowed :
- dark red: blocked explicitly
- light red: blocked by a more general rule
- light green: allowed by a more general rule
- dark green: allowed explicitly
To create a rule, click on a cell until you get the desired color.
The drop-down list at the top left indicates on which websites the rules apply. By default, a rule only applies to the website's domain and it's subdomains. If you want to create a rule that applies to all websites, select "all websites".
The 5 buttons:
The badge on the icon shows the number of blocked requests.

Examples

Make Youtube works (1st screenshot)
1. Go to a Youtube video and click on the addon icon
2. Click on the arrow button to display the parent domains
3. Allow XMLHttpRequest (XHR) for googlevideo.com
4. Reload the page
Allow embedded YouTube videos on all websites (2nd screnshot)
Allow everything for a website (3rd screenshot)
1. Make the "JS", "XHR" and "FRAME" cells dark green

Other examples can be found on the wiki. Limitations The extension does not work on domains listed in the preference "extensions.webextensions.restrictedDomains", mainly Mozilla websites such as https://addons.mozilla.org GitHub https://github.com/billdoor1/javascript_firewall