After installing this add-on, here’s what happened in my case:


Improvements

I used to be unable to watch Netflix and Amazon Prime videos in Firefox, but now I can.


Issues

When YouTube videos are shared and embedded on the social media platform X, I frequently get a message saying “Cannot play on this device” when I click play (however, I can watch them if I go to the YouTube website. The issue only occurs with YouTube videos embedded on X).

Update:

I’m also getting the “Cannot play on this device” message and can’t play YouTube videos embedded on other websites.