Interestingly, in the firefox deb opening webcal:// hyperlinks works OOTB, without any change (after thunderbird has been registered as a handler for them).
** No longer affects: firefox -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1960421 Title: webcal:// URLs do not open calendar application To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1960421/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs