I followed the advice found in this forum ( Rui Pais, via Michael "TheZorch" Haney) and updated the Thunderbird config statement to designate Firefox the HTTP link handler and it worked. The question remains: what happened that it was absent?
-- Clicking link in email does not open browser https://bugs.launchpad.net/bugs/210804 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs