Hi, After upgrading to firefox-82.0.2-1.fc33, my gmail tab fails to load with a numeric error 9, whatever that means for Google. Signing out and trying to log back in results in the same error. I have to manually delete the cookies set from mail.google.com and once that's done, gmail loads fine. As soon as firefox is restarted, I have to repeat the same process if I am to access gmail. As far as I can tell, there is no such problem with other Google sites that I've tested, i.e. maps, hangouts, photos, drive, play store, calendar, youtube, keep and search. Downgrading to firefox-81.0.1-1.fc33 solves the problem.
Same for me having just upgraded to 82.0.2-1 from 82.0-5. Deleting cookies for mail.google.com wasn't enough though - I ended up also deleting cookies for accounts.google.com (meaning I had to go through 2FA to log in to my Google account again), and I also deleted the Cache Storage for Gmail. Seems to be OK across Firefox restarts now.
Spoke too soon :) I got "Temporary error" again after restarting. But doing a hard refresh (Ctrl-F5) gets it loading (without clearing cookies/cache storage).
Might be this: https://bugzilla.mozilla.org/show_bug.cgi?id=1668920
"firefox-82.0-5" is the last build that worked fine (FC32 + FC33). Starting with build "firefox-82.0-6" (or whatever is available for FC32 + FC33), Firefox breaks Telegram (web.telegram.org), Gmail (mail.google.com) and other sites. Shift-Reload solves the issue, but it occurs again every time the web site is loaded. It doesn't help to clear cookies, it may work for some time, but the problem eventually comes back. Maybe the same problem as bug #1893548 and bug #1893474 (most people just notice the problem with Gmail, but it's a general problem affecting more web sites).
*** This bug has been marked as a duplicate of bug 1893474 ***