I have been having so many problems with Google Mail that I have switched to another browser. I keep getting error messages such as,"Oops," " Retry in x seconds," "You may have network problems," etc. I also am unable to send messages. I understand that this is a result of Firefox's latest update. I tried the following suggestion: "Here's how you can disable that feature in case you don't find a more convenient workaround: (A) 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. Please keep in mind that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future. (B) In the search box in the page, type or paste security.tls.enable_0rtt_data and pause while the list is filtered (C) Double-click the preference to switch the value from true to false " However, this worked for a short time and then I started getting the "Oops" message again. I cannot use GMail on Firefox. Please, please fix the problem.