Does the problem start as soon as you start Firefox, or do Google sites work for a while and then stop working? '''''Mid-Session Breakage''''' A year or two ago, users reported loss of ability to connect to Google, including "Oops" messages on Gmail. They traced this to the "zero round trip resumption" feature intended to speed up website connections. ([https://blog.cloudflare.com/introducing-0-rtt/ Explainer post by CloudFlare]) There is a hidden way to disable that feature and see whether it helps: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' (2) In the search box in the page, type or paste '''0rtt''' and pause while the list is filtered (3) Double-click the '''security.tls.enable_0rtt_data''' preference to switch the value from true to false. (4) I don't recall whether we had the '''network.http.http3.enable_0rtt''' at that time. You might need to toggle that one to false as well. After that, try Google again. Any improvement?