Are you allowing cookies of do you use the 'Ask me' setting? To see all History and Cookie settings, choose: *Tools > Options > Privacy > Firefox will: "Use custom settings for history" Did you check the cookie exceptions? You can inspect and manage permissions for the domain in the currently selected tab via these steps: *Click the "[[Site Identity Button|Site Identity Button]]" (globe/padlock) on the location/address bar *Click "More Information" to open "Tools > Page Info" with the Security tab selected *Go to the Permissions tab (Tools > Page Info > Permissions) to check the permissions for the domain in the currently selected tab You can inspect and manage permissions for all domains on the <b>about:permissions</b> page. *https://support.mozilla.org/kb/how-do-i-manage-website-permissions If clearing cookies didn't help then it is possible that the cookies.sqlite file that stores the cookies got corrupted. *Rename (or delete) <b>cookies.sqlite</b> (cookies.sqlite.old) and delete other present cookies files like <b>cookies.sqlite-journal</b> in the Firefox profile folder in case the file cookies.sqlite got corrupted. You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History > Show All History" or "View > Sidebar > History") or via the about:permissions page. Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks, cookies, passwords, cache, history, and exceptions, so be cautious and if you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note. You can't recover from this 'forget' unless you have a backup of the involved files. It doesn't have any lasting effect, so if you revisit such a 'forgotten' website then data from that website will be saved once again.