> Sorry, your browser isn’t supported. > Please use a supported browser Chrome, Safari, Firefox or download Pop for Linux. I'm using Firefox 91 on Ubuntu 20.0

> Sorry, your browser isn’t supported. > Please use a supported browser Chrome, Safari, Firefox or download Pop for Linux. I'm using Firefox 91 on Ubuntu 20.04. Is this a browser version check failing or a some missing capability? Maybe one of the extensions in my browser is blocking something needed by Pop. It seems to work on Vivaldi. At least it gets to the account registration page. I hoped it would work without an account so I didn't go any further.