EricDHH, The issue you describe isn't specifically related to Firefox. Holding any package in synaptic will not stop an upgrade using apt or unattended-upgrades. I believe the opposite also to be true, holding a package with apt-mark won't stop synaptic upgrading it.
I'd like to close your bug report by marking it as a duplicate of bug 1766161 which although reported later has been worked on by the Bug Squad, the importance has been set and of course is already assigned to the correct package. Do you agree that the other bug adequately describes the problem that you came across with Firefox 56/57? Paul White [Ubuntu Bug Squad] ** Changed in: firefox (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1732946 Title: Firefox 57 ignores package on halt To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1732946/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs