This is currently not Thunderbird's problem. This is Firefox's problem. see
Firefox file-> email link regression: Thunderbird is already running https://bugzilla.mozilla.org/show_bug.cgi?id=1933006 Please tab this bug report as a duplicate of the above -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/711305 Title: Thunderbird is already running, but is not responding. To open a new window, you must first close the existing Thunderbird process, or restart your system. Error received when clicking a mailto link in firefox. To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/711305/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
