This extension attempts to interfere with all websites in your browser, not just YouTube. I'm disabling it until it only works on YouTube. You should too.

Does a good job at sustaining the qaulity you choose my ONLY issue is when I tested it, it kept giving me error code 153

not working

Фиксирует заданное мной значение качества через раз. Перестало устраивать.

Does not work

Does not work

Check Mozilla support.

Access your data for all websites

The extension could read the content of any web page you visit, as well as data you enter into those web pages, such as usernames and passwords.

doesn't work.

Doesn't work

This is no longer working, plus it requires some unnecessary permissions.