Feature/issue 165

Adds functionality that allows the user to whitelist certain potential trackers which need to be whitelisted to work. E.G. Youtube comments. This feature is already present in the chrome version but this would add it to the firefox version. CC @jsha for review. 
Agreed, that is also my personal style as well. I think this style was from another coder. Fixed. Also fixed this everywhere else in the code base.