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When i go to fullscreen from default view on YouTube, the screen becomes grey but the video is still playing and the audio is working fine. However, i can go to fullscreen just fine if im in cinema mode. How do i fix this?

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YouTube videos are frequently buffering and sometimes play slowly in Firefox, even when my internet connection seems to be working normally. Please help me identify the cause and suggest steps to fix the problem. I would also like to know whether any Firefox settings, extensions, cache, or hardware-acceleration settings could be causing this issue.

Hello, this is the basic problem:

The short version is that there is a problem with Firefox not interacting with the scrub bar and volume bar. (all other controls work fine) We know it's a Firefox thing because everything works with Brave. (or an interaction between Firefox and the OS at least, Firefox is heavily involved)

There is more detail and we have done some work on it here: CashyOS forum post

You can use the Firefox manifesto V0.2. video for an example, as it displays all the above problems for me.

I can get you guys whatever other data might be needed, but I kinda need an idea where to look to try and fix this, as all the other posts I have managed to find don't seem to have similar enough issues to work.

Edit/Update: I have done some further testing and discovered that it is firefox's default/built in player that is the problem. I can use the 'site specific' players (like from reddit) just fine. So there is something happening with that default one.

How can I figure out why NYTimes videos don't with in my android browser?

I've tried resetting my browser and reinstalling Firefox and they still don't work.

I had the same issue on desktop but after the new update today, they now work.

Okay so this never happened with Chrome, so I'm assuming it's a firefox only issue. Whilst I'm watching a video, if said video is playing in fullscreen, it'll often fade to black during different parts, such as whenever a flash happens or quick cuts (e.g. a film with lightning strikes, causes it to fade to black and it stays like that). It is SUPER annoying and it causes me to have to rewind if I miss something because of it! I don't watch YouTube in fullscreen because of it, but it even does it in streaming services! I honestly have had enough but do not want to switch back to Chrome.

Took this photo of the movie Cruella because I knew there was loads of flashing lights at one scene. You can see that the video is faded but the rest isn't. The second image is when I click multiple times to try and stop it! But it happens again directly after.

And yes, I've tried the 'full-screen-api.transition-duration.enter' and 'leave' in Advanced Preferences.

All of a sudden all of the videos I watch on YouTube with Firefox are defaulting to mute on my Macbook. I haven't made any changes to settings, etc. I don't have a YouTube account so I can't make any changes there anyway. I am having to unmute each video before I watch it.

Playback occasionally lags really hard for 1-2 seconds anytime I watch a video. This goes for all websites, not just youtube. It seems disconnected from buffering as it will happen even when the video is totally loaded. It doesn't lag out any other tabs, and switching to a different tab and back always fixes it (for that moment). I've already tried disabling hardware acceleration and webgl, but nothing changed. It happens about once every minute no matter what. I have a high-end pc, so that shouldn't be the problem. (or maybe it is, and firefox isn't optimized for some bit of hardware that I have) Thank you ^_^