I am working through Leapforce, for which I installed version 6 of Firefox. I just started working for ChaCha, which requires version 3 of Firefox. How can I install version 3 without changing the existing version and how can I keep the two browsers separate, since they both require their own toolbar (Leapforce does not allow any additional toolbars)? I need easy access so that I can switch back and forth when the jobs have tasks available. Also, I can only find downloads for the newest version.