Had the most problems with this extension.
Youtube not loading comments/videos/anything at all , basically a white page.
Another 2 sites giving me a robotic voice when listening to the audio of the videos.
I changed the user agent over 20 times with the hope that I would find one that doesnt cause problems.
And to top it off it was very hard to realise that this extension was causing my problems since 1 out of 10 visits on those websites it would work perfectly.
So i had to clear the cache/data of the web browser , reinstall the webbrowser , reinstall a lot of system components just to find out that this extension was the problem.