Hello, This may be a wordful but please do consider reading. Recently im having problems with firefox android. Im on Galaxy Tab S9. When playing youtube videos in landscape mode, there would be elements (thumbnails, texts) overlapping as if they were layered. I tried using different versions of firefox(beta, nightly, fennec) without addons, with default settings and fresh installs but all of them exhibit same problem. I tested on duckduckgo and chrome but theres no distortion. It means that its the problem with firefox. Another find is that, there is no distortion when im using youtube without logging in. The problem occurs when i log in to youtube. I tried with different youtube accounts and they all have same problem on firefox. Also, when playing videos and if i clear cache and cookies of youtube from address bar, it logs me out of youtube and the distortion is gone as well. Things I have already tried: 1. Clearing cache, cookies of website, browser. 2. Clearing data, cache of app, uninstalling 3. Using default settings without addons 4. Fresh installs of different versions 5. Deleted firefox folder from android/data/mozilla in hope of clearing corrupt cookies (dunno if really got deleted) 6. Using different account for youtube Funny thing is problem goes away after logging out of youtube but it shouldn't be a solution. I would appreciate your time, possible solutions for this dumb problem. Thank You