Firefox is logging me out of my Gmail account about every two days. I have two accounts. I usually keep them each open in a tab all the time, because I don't like having to open and log back into things constantly. I'm running a Mac. The problem started maybe a few months ago. I've tried resetting the browser cookies, downgrading my security settings to moderate, and whitelisting gmail. I do run uBlock, AdGuard, and Privacy Badger, but I also have those on Chrome, and when I did a comparison test I didn't have the same issue there. I can be in the middle of clicking on an email and Firefox will boot me out. This problem is mostly specific to Google. I'm able to stay logged in to other sites (yahoo mail, ravelry, etc.) over periods of weeks or even months. Some other accounts might be affected, but they're ones that usually make me log in more frequently, and that I use less often.