Click the menu button
, click help
and select Restart with Add-ons Disabled.... Firefox will start up with the Firefox Safe Mode dialog.
Note: You can also start Firefox in Safe Mode by holding down the shift key while starting Firefox.holding down the option key while starting Firefox.quitting Firefox and then going to your Terminal and running: firefox -safe-mode You may need to specify the Firefox installation path (e.g. /usr/lib/firefox)
Select Continue In Safe Mode.
From the Tools menu select Add-ons.
Select the Extensions panel.
Select AVG Safe Search and click Disable.
Click on Restart Firefox.
Other crashes with this signature
Other causes of this crash can include Speedbit download accelerator, Venturi Firewall, QuickTime plugin. If you use these programs, updating them may help.