Silly me... apparently this is caused by firefox not being able to write its browsing history due to limited disk space in the user-directory. Freeing up some space resolves the issue.
I would, however, expect Firefox to give me some information about this. Should this perhaps be considered a usability-"bug"? -- "Back"- and "Forward"-buttons broken https://bugs.launchpad.net/bugs/276923 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
