Fresh versions of Firefox-ESR, Brave and Opera made it for the moment, however you need to find a way to allow them cookies while they persistently re-iterate, disabling our settings window. I find it absolutely unacceptable behavior to lock people out of their data - their property - without providing comprehensible reasons such as 'your browser is too old, only versions from xxx are supported'. And if this doesn't happen automatically, it should be communicated immediately in support requests. The way it is done, despite all good intentions, are malicious experiments with the users.