I found a possible solution...sort of. When I googled this problem most solutions said that it's the Ask.com toolbar that got snuck on people's systems from other installations that is causing the problem. They were told to uninstall it and to delete Asksearch.js in the components folder in their firefox directory. For those people that solved the problem. I didn't have Asksearch.js and I've installed Ask.com a long time ago. So after disabling all my extensions and then enabling them one by one I discovered that the Leechblock extension was the one causing the problem for me. Hope this helps someone.