Looks like WebRender has been enabled by default as of Firefox 92 (September 7, 2021) so that's great news! I think most of my performance problems were due to

Looks like WebRender has been enabled by default as of Firefox 92 (September 7, 2021) so that's great news! I think most of my performance problems were due to filters so I'm eager give it a try. I saw your comment on Bugzilla and will do that if I'm still experiencing issues after testing it. Thank you!