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Andrew S edited this page Jan 26, 2026
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4 revisions
Because of recent changed on Google's end, we now need to run special scripts on Youtube.com to get the required tokens; otherwise, FastStream won't be able to retrieve video data.
As a result, FastStream now requires the userScripts permission for Youtube playback. This permission allows us to run any code on the Youtube page, including those fetched from online servers such as Google. Because this is a dangerous permission, you need to enable it separately in your browser's extension settings.
For Chrome
Note: if your chrome version is older than V138, you will need to turn on developer mode in the extensions page.
Go to chrome://extensions/ and click "Details" for the FastStream extension
Turn on "Allow User Scripts"
For Firefox
Unfortunately, it doesn't work on Firefox for some reason. Will fix soontm.