So, here is a new version of one of the most beloved browser in the scene right now. Since the release of Firefox Quantum, Firefox has seen some growth in their user base, and that’s not only why people has switched to the Fox browser, there seems to be a trend on getting away from Google Services and try to give some power to other companies in order to improve the balance of market share.
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.