It seems the "Email link to this button" in Firefox is suddenly broken. When I click it, I get a message box with the error:
"Thunderbird is already running, but is not responding. To use Thunderbird, you must first close the existing Thunderbird process, restart your device, or use a different profile."
Yes, Thunderbird is already running. On my machine, it's always running, and always has. That never was a problem before. Also, I can without problem enter xdg-open mailto:<some email address> in a shell and a mail window opens. I conclude therefore it has something to do with Firefox itself. I already searched the interwebs for this error with Firefox, with no luck. Maybe it's just on my machine. I'd appreciate it if someone could try that out on their machine and tell me how it went. Thx a lot.