I was watching videos and I noticed that sometimes my FF freezes when I look at the preview of a video. The computer is working fine since I can tell that it is only the browser "screen" that is freezing and not the whole pc. I can fix that by clicking outside the browser's window, like clicking the taskbar and it goes back to normal, still very annoying. I was able to completely fix the issue by unchecking the option "Use recommended performance settings" and just leaving the option "Use hardware acceleration when available" ON. Now I don't have these random freezes while still being able to use hardware acceleration.

My question is: what are those "recommended performance settings" that FF was using? I can't find any information about them or a list. I know that FF uses my pc specs to determine those settings but I wish I could manually set them by myself. Any ideas? Thanks!