Has it been Mac Tested?

Firefox and IE on Mac?

No, it has not been tested on Macs yet.

I am pretty sure that it will work with Firefox on Mac as it does on Windows.

However IE on Mac is a problematic browser and not developed anymore so it may cause problems.

Other popular Mac browser, Safari is also expected to be compatible.

Any feedback on Mac tests would be appreciated.

I tested the script on Mac OS 10.3.9 with Firefox 1.0
worked perfect, authentication, upload, download, delete, mkdir etc.

I don't have IE on this machine, but as Cem said, IE isn't supported nor developed for the Mac anymore.  Use Safari.

One other interesting item to note, I used it with firefox and over a Cisco Web VPN connection (https tunnel) pretty slick!