$ cat /etc/debian_version $ apt-cache policy iceweasel $ reportbug iceweasel # You might want to submit a bug, or just post here the dependency report it generates If that doesn't fix it or shed any light, you might try running Iceweasel as a different user, or with a clean Iceweasel profile. If that still doesn't help, you might try: $ sudo aptitude update && sudo aptitude upgrade And if that still doesn't help: $ sudo aptitude dist-upgrade Good luck.