TL;DR Go to about:config, look for these settings and change their values.
To remove the fullscreen fading: full-screen-api.transition-duration.enter => 0 0 full-screen-api.transition-duration.leave => 0 0 full-screen-api.transition.timeout => 0 To remove the fullscreen warning: - full-screen-api.warning.timeout => 0 Did you ever notice how long does a video go fullscreen on Firefox? I mean, you double click it, the screen goes black, and a second-ish later the video actually appears.
It’s been a couple of weeks since I switched to Firefox because I want to support The Open Internet and Mozilla says it’s an ethical browser. Even though, being ethical or not, I don’t agree with the idea of Google controlling every corner of the web. So after switching I noticed something that really itched me instantly: opening autoplayed videos pages in new tab doesn’t autoplay.
In Chrome autplay videos do not auplay until the tab is in foreground or active.