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. 
Also agreed that this would be the preferable exports style. There are several inconsistent style issues throughout this code base. The whole code base is frankly due for some spring cleaning and refactoring.