On certain websites I can't login, firefox keeps opening new tabs with the same login page. For instance, I try to login on Zulily, I click the 'sign in ' link in the top right corner of the box (image 1),I enter my email address and password (image 2) and click the 'shop now' button. I'm redirected to the first screen (screen 3), I did not just rename image 1 as image 3 and re-upload it. Image 3 is the actual 3rd window I'm redirected to. I have cleared cookies and caches and histories and deleted possibly corrupt cookies.sqlite files. I have cleared the startup cache and disabled add-ons and logged in in safe mode. I have uninstalled and reinstalled firefox. It's not all sites with logins, either. just certain sites, and it remains consistent which sites I can or can't log into. I have googled this problem with as many different re-wordings as I can come up with and no one else seems to quite have this exact problem. I'm running Firefox 86.0 64 bit for linux mint on Mint 20.