Can't get 4K YouTube on Firefox but Can on Chrome

I have excellent internet connection. I switched to Firefox a couple years ago ever since the anti-adblock on youtube fiasco a while back. I've always been able to play YouTube at 4K up until I'd say the past week.

I use ublock on Firefox, but not on Chrome (I only use chrome as a compatability browser for weird chrome-only websites). I disabled ublock on Firefox to see if YouTube was detecting if I had an adblocker and limiting bandwidth to me, but I still can't even choose any resolution higher than 1080p on YouTube while using Firefox (720p on the example video I took a screenshot of with Firefox on the left and Chrome on the right).

Does anyone else have this issue? Does anyone know of any fixes?

Edit: I have not been able to figure out if my particular browser settings in Firefox (the most up-to-date version) has prevented me from using 4K YouTube, or if it's a certain addon I have installed, or if it's YouTube's doing. I'll use a different browser specifically for YouTube and use Firefox for all other browsing.