Firefox bad interractions with POE2

I've changed my browser because I couldn't watch a video properly on Firefox while playing the game.
Now I had an issue where I couldn't stop the game from running in Steam, no process in Task manager and the solution was to... close firefox.

Found it here : https://www.reddit.com/r/pathofexile/comments/18dy8ig/path_of_exile_steam_process_wont_stop/

I see that other in the forum having issues with firefox and the Triple buffering as well.
I'm thinking, it's either a POE-Firefox issue or a POE2-Windows one.

More investigation are required :)

I had no issues with Firefox until I think yesterday when the browser just basically breaks when I try to use it while running Path of Exile 2.

Quite strange. Edge works fine. Don't want to use Edge.

Don't really want to use Brave again but it's the best of the Chromium ones that I know of. We aren't going down the Chrome route anytime soon.

Can't figure it out.

Potentially related, though.