Not a debugging help, but: I have the same issues. Especially the tab thing. Open one, try to open a page, nothing happens. This is especially bad on android for me.
Number 3 is something Firefox has done for ages, even before quantum. It will refuse to start of there is another, non-responding, instance running. I think they actually added a dialog for it that sometimes works.
Number 1 is something I see on Linux every now and then. For me, only the mouse input is ignored then. But sometimes Firefox just hangs without crashing (Probably some loop somewhere went nuts).
I do not have solutions for this. I just want to add, that it probably is not because of OPs system.
"When using all 16 cores at a TDP of 5 watts, it is actually a lot slower then the core i3-1969UwU, making it pretty useless for battery operation. Consider buying an intel CPU.
This is absolutely ridiculous. Looking at what we get out of mobile CPUs today, when I have a laptop with an i7-7700HQ from 2017 that has.... 4 cores/8 threads and is turboing to somewhere in the mid 3GhZ range. With a 45W TDP.
The last 5 years have been such a turbo charging for CPUs
Oh yes, I am aware of usb-c fuckery. I spend the last year on it.
In this case, I put the blame on the steam deck. The dock does not make any problems with any other device and it only happens on high load on the SD side. So while there could be issues with the dock, chances of that seem slim.
Honestly, I cannot blame him for that. This requires deep knowledge of the subject and the fix is not easy to spot.
I have been using Linux for a decade now on desktop and server systems and he'll, even I would probably have told the package manager to go do it's shit and borked my system. Because getting weird errors, warnings and conflicts is just "the Linux experience" (TM)
I hope more flatpack based distris come up or stuff like nix gains some following. This would make it a lot easier for people with less knowledge to get into the Linux space without much technical knowledge or the possibility to Bork the system (to a degree). Meanwhile classic distros can serve the more technically inclined audience.
I had a small laught when seeing that the UI is basically Spotify. Listening to YT music "via Spotify" is such a delightful thought.
But I will probably try it out. The YTM web interface runs like ass on my laptop (Takes about 3 seconds just to skip to the next song), so this might make the UI usable by just plain replacing it.
I mean X11 is a janky mess. Wayland adds a lot of improvements (I can finally do screen-based scaling with logging out!). The software support on DE side is just missing a bit (Tho it has gotten leaps better in the last 5 years, I am now using KDE in wayland mode with an intel iGPU without issues! Hussah!)
I have the same (or at least very similar) issues on my system. So it probably is some sort of Firefox issue.