RONIN_1  I installed Portable Firefox 3 rc4 on a USB hard drive that had been formatted on a Mac (OS 10.5.3) which had previously run Portable Firefox 2.x. When I went to launch it there was a white circle/slash over the Firefox icon and when double clicked it says something to the effect that it does not support this architecture (the Mac is a G4). Bummer, it does not work.  
(Version 3.0r4.0)

SJJ_PUBLIC  This is based on the similar Hybrid portable firefox that supports both Mac and Windows. There is good reason to make the Mac part better, but why remove the Windows support? It is very useful to be able to use Firefox on someone elses Windows PC if that is all that's available to you. Just not sure I understand why this is a separate, Mac Firefox-only version. Perhaps the author should just contribute their Mac-specific improvements to the original?  
(Version 1.5.0.1r3.0)

JPS  To the developer: I've been trying to fix a strange behavior in Firefox on my Mac since I downloaded your app. Here's the link to the discussion on the Firefox forum:

http://forums.mozillazine.org/viewtopic.php?t=374494&postdays=0&postorder=asc&postsperpage=15&start=0&sid=a2c2b33127b61636664e91c3e53e7cb5

If you can't open the link, you can email me at jps200@gmail.com

It's possible there may be a bug in your program.

Thanks,

jp  
(Version 1.5r2.0)