I'm almost sorry to ask this, but does anyone have experience with Firefox on Linux taking a long time to open? I'm running Pop!_OS on a fairly modern machine. All other programs open pretty quickly, but Firefox seems to drag its feet on startup. Once it's open it's great, no problems with speed.
I have tried disabling extensions (ublock origin, sponsorblock, decentraleyes, i still don't care about cookies) and I have tried setting my default profile as one without any custom user.js (I have a profile with Arkenfox and one with Betterfox's user.js). Nothing I have done so far has seemed to make any difference, but Help->Troubleshoot Mode allows Firefox to open quickly, so there must be something that I can disable that is causing the issue... Any ideas? Thanks.
Edit: Seems like swapping to the flatpak version made things much faster. The Pop!_OS .deb version must be snap like you all said :) Thanks everyone!
Is Firefox installed as a snap package on PopOS? That could be it if that's your only snap package. I'd recommend installing a Firefox fork that's a regular deb package (Libre Wolf probably?) and seeing if that changes anything
Just checked, I'm using the deb package.