A critical bug is "A bug which has a severe impact on a large portion of Ubuntu users" (https://wiki.ubuntu.com/Bugs/CommonTasks).
Not being able to import firefox bookmarks is very annoying in some situations, but in my personal opinion doesn't rate critical; critical are bugs like "X doesn't work for all users" or "filesystem continously corrupt files" or "passwords are found in cleartext in a a file on disk". This bug report is currently rated "medium", which seems about right looking at the descriptions on that wiki page. -- Firefox / Can't Import Bookmarks https://launchpad.net/bugs/62116 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
