I've been a Firefox user since 2011 and don't have issues with most websites. Haven't had issues with the browser over the years on multiple different computers either. Steam, for the most part, is perfectly fine and usable as well, in fact - I'm typing this whole post on Firefox.

However, whenever I enter the Points Shop or view a Steam Broadcast, it becomes insanely laggy. Like, to the point where my PC feels like it's struggling to render it, despite me having a pretty good computer (specs below).

Here's the kicker - when I view these things on the Steam app itself, it's totally fine. Even on Chromium-based browsers like Edge or Brave - it's perfectly fine. It's only the moment I go back on Firefox that it craps itself.

I tried using the UserAgent spoofer plugin and trick Steam to think I'm using a Chromium browser, but it doesn't seem as though that makes a difference. Makes me think it's a Firefox issue as well.

I've attempted to enable/disable GPU acceleration, neither have provided sufficient results. I've also attempted to isolate the issue by disabling all of my browser add-ons, including uBlock Origin, and those haven't provided any respite either. Only thing I haven't tried is a fresh Firefox launch, which I'm hesitant to do since I have so many logins saved, etc., though I could try to make a new local user account and use Steam through that to see if my browser really is just cluttered. Before that, I want to know if there's anyone else in the same boat as me.

Here are my PC specs to weed out those who think "oh its just your pc, get a new one":
CPU: AMD Ryzen 5 5600X
RAM: 32GB DDR4 3200mhz
GPU: Palit Nvidia GeForce RTX 3060 12GB
OS: Windows 11 22H2

Everything's installed on an nVME SSD.