$ 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 , you might try:

$ sudo aptitude update && sudo aptitude upgrade

And if that still doesn't :

$ sudo aptitude dist-upgrade

Good luck.


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