The Mozilla organization produces two browsers:
1. Mozilla -- a browser suite (integrated email) and
2. Mozilla Firefox (a browser)
They are closely related but the version numbers are different. Firefox is currently at 1.07 about to jump to 1.5.
Mozilla is at 1.7.1 .
I suspect that if you have Mozilla 1.5 you probably have a slightly dated version of the Mozilla suite.
No....I know the difference. I have Firefox 1.5 stand alone.
I have been using the release candidate versions of 1.5 and the last update moved up to release version 1.5 several days ago.
Hence, it's the released version of Firefox 1.5 from the Deer Park site.
My bad.