duplicate of [/questions/1250739] thread Hi... I just tried this but it didn't seem to work, so please forgive me if it is posted 2x. When I try to log into some sites, I keep getting the error message shown on this screenshot: https://www.screencast.com/t/MzE0sDvp (For convenience, I'll try to upload the screenshot, too, but that didn't work before.) I have tried the suggested fix: uninstall/clean reinstall. I did that 2x. Even restarted my computer between uninstall/reinstall. It did not work. The error message persists. I am on a desktop PC, Windows 10 1809, must up-to-date version. I also have always been on the most up-to-date version of Firefox, as I have auto update enabled. Currently, I am on v 65.0.1. The problem persists. As the screenshot shows, some sites think I am on version 56. I have not been on that since version 57 was released. Can someone please help? Thanks, Bruce