Just an FYI for people if this does not work for you I tried version 44 (the current version at the time of this post) and extracting it did not work. I notice that It did not have the Core folder and setup, but only the Setup. So went and found an older version, I used version 36 and when i extract that it had both files as described above and I could then install Firefox i just had to run a few updates. I don't know what version things changed but i know version 44 will not work and version 36 will.