Yes!
Actually, we should wait to see what @UCyborg will say about the meaning of PH. It's better to not guess random meanings, as that could be a waste of time imo, and the guesses could be wrong.
Make sure you have Enabled=1 and BuildNumber=7600 added and not FirefoxFix, as FirefoxFix has been removed since June last year. You also should make sure you're pointing at the right directory, see this to understand what I mean. (but remember to disregard FirefoxFix from that link)