I've also had this problem since updating to 12.04 (64bit). I deactivated all add-ons in firefox but the problem remains. This problem was also mentioned in German-speaking ubuntu forums with no solutions yet...
I've also had this problem since updating to 12.04 (64bit). I deactivated all add-ons in firefox but the problem remains. This problem was also mentioned in German-speaking ubuntu forums with no solutions yet...