Firefox 5 has an option that lets users to quickly disable all the installed Add-ons and restart the browser. This is an useful feature when you are experiencing problem with your browser installed with many Add-ons. Manually disabling all the Add-ons would take time instead you can use this option for disabling the active Add-ons. You can access this option under the Firefox Help menu.
Click Help menu and select Restart with Add-ons Disabled
In the Restart with Add-ons Disabled dialog confirm whether you want to disable all add-ons and restart. And to confirm click the Restart button.