Have you tried to start it from the terminal? Maybe there is some insight into which part of the startup process is taking so much time
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What if you export your bookmarks and your addons, then delete your profile, create a new profile and sync NOTHING from your firefox account. Then import the boomarks, restart and see if that is the issue. Then add your addons one by one and restart inbetween to see if one acts up. Then change your firefox settings. Then turn your sync back on. Also are you using a normal installation or a flatpak, snap, etc?
This is some proper troubleshooting.
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Import your bookmarks in sections until you hit the one malware URL that’s mining coin through the Firefox’s interface.
Is it just bookmarks, or is it bookmarks and sync? I’d export your bookmarks as JSON or something and look through it, either with a text editor or some tool, and make sure there isn’t some enormously huge string, or one containing unsupported characters, that’s tripping something up somehow.
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Maybe export your profile to some other browser. Wipe your Firefox install and all of its user data. Reinstall Firefox import from the other browser.
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That’s an interesting tell. Assuming you don’t have several gigs of bookmarks, The next step would be to break the bookmark file apart into multiple pieces and see which section is punking you. Hell even just exporting it to HTML, You might find a really long or malformed mark by looking over the file.
Anyway, here I go providing more support for somebody that’s not asking for it. Good luck in your endeavors
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What if you delete all your bookmarks? Does that help?
What about deleting all bookmarks, reinstall Firefox then sync account with no bookmarks.
What about exporting bookmarks and adding them to a fresh Firefox without a profile.
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