fixed it by rollilng back the upgrade.
> sudo apt-get purge firefox*
> ls /var/cache/apt/archives/ | grep -i firefox
firefox_25.0.1+build1-0ubuntu0.13.04.1_amd64.deb
firefox_25.0+build3-0ubuntu0.13.04.1_amd64.deb
firefox-globalmenu_25.0.1+build1-0ubuntu0.13.04.1_amd64.deb
firefox-globalmenu_25.0+build3-0ubuntu0.13.04.1_amd64.deb
firefox-locale-en_25.0.1+build1-0ubuntu0.13.04.1_amd64.deb
firefox-locale-en_25.0+build3-0ubuntu0.13.04.1_amd64.deb
> sudo dpkg -i firefox_25.0+build3-0ubuntu0.13.04.1_amd64.deb
and prevent future updates :
> echo "firefox" hold | sudo dpkg --set-selections
I am on Xubuntu 13.04
Linux ns53sv 3.8.0-33-generic #48-Ubuntu SMP Wed Oct 23 09:16:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux