Fixing a Conflicting Firefox Add-on
The easiest way to confirm that an add-on is conflicting with Firefox is to start Firefox in “Safe Mode." To do this, go to the “Start" menu then hover over “All Programs." Wait for the menu to display all programs installed and then hover over the entry for "Mozilla Firefox" to make the context menu pop up. Select “Mozilla Firefox (safe mode)"and when the dialogue box opens, select the option “disable all add-ons." Then, select "Start Firefox in Safe Mode." If Firefox starts, then the problem is indeed an add-on.
To determine which add-on is conflicting with Firefox and causing it not to open properly, the process is simple, but time-consuming. After confirming that Firefox does open in Safe Mode, the user must enable each add-on one by one and only one at a time. This way, using deductive reasoning, the user can determine the conflicting add-on.
With Firefox open in safe mode, click on "Tools" from the menu bar at the top of the browser. Then, when the context menu opens, click "Add-ons." All add-ons should be grayed out because they are disabled. Simply click the first add-on and click, "Enable." You will need to restart Firefox to complete the add-on enabling. If Firefox opens, that particular add-on is not the problem. Disable the add-on and move to the next one, repeating the steps until the user has found the add-on causing the problem.
Once the user has found the problematic Firefox Add-on, he or she must either disable it permanently or attempt to find a more compatible version of it. Either way, visiting Mozilla Firefox's Add-ons website can not only help find a suitable replacement for the faulty add-on, but it can also offer the user more support and the ability to receive help from Mozilla with the issue.
Support & Sources:
Mozilla Firefox Add-Ons
Mozilla Firefox Support Page