As I’ve mentioned before, Firefox is highly customizable. You can add themes, extensions and plug-ins to add new features to your browser. But there are lots of configuration options that you can change as well. I am not just talking about those that you can get to via the Tools, Options…menu. Firefox has a ‘control panel’ of sorts, called about:config. To access, simply open a new tab and in the address bar type about:config.But wait, there is another and ‘easier’ way to get tot this ‘control panel’. It is the AboutConfig extension, once installed you can add a button to…