Cannot logout from an unsupported browser
When I login with Firefox ESR, I get the [Unsupported Browser Message](https://teams.microsoft.com/_#/unsupportedBrowser), which is fine... except there's no way to logout from there. It is a security risk if users can never logout after logging in. Please, either display the UnsupportedBrowser page before letting a user login, or add a logout button to that page.
Firefox ESR is mandated by my company, so we cannot upgrade. My current version is 52.6.0, but that is not really significant here.
Mark Crocker commented