bw, you're right.
I just downloaded, installed and tried Firefox for the first time. It worked on Gap.com like a charm. Interestingly, when I clicked on Gap.com's "web browser" help section, it doesn't mention Firefox at all. It states the following:
Gap Online is best viewed with AOL version 5.0 or higher, Netscape Navigator version 4.7 or higher, or Microsoft Internet Explorer version 5.0 or higher. You can upgrade your browser at AOL, at Netscape, or at Microsoft for free.
By the way, am I imagining it, or is Firefox a faster browser, with clearer graphics and the same general utility as Safari. It's the first alternative browser I've tried, and I really like it a lot. Everything seems to load faster than Safari.
Must say, though, it's still a pretty lame choice by Gap/Banana Rep./Old Navy to design a web site that prevents access by Safari users, seeing as how Safari comes installed and ready to go on all Macs. Not sure why they'd want to make it difficult for us. Oh, well.....
Thanks for the tip re Firefox.