mwobensmith

Move Firefox properties out of core code and into FirefoxApp class

2

In the core API `Settings` class, we have a bunch of properties that apply only to Firefox. Since these are not relevant to the core project, they should go somewhere...

Can't change Firefox preferences of type Boolean

7

You can set a preference to a Boolean value, but it only works on new prefs. It can't change the value of an existing Firefox pref. e.g. ``` preferences={'app.normandy.first_run': True,...