JBoss Tools 3.1.0.M4 does not include a version of XulRunner for 64-bit Mac.
However, the latest nightly builds from trunk DO contain a Cocoa XulRunner... but only for 32-bit.
Or for offline install, try this update site zip:
If you want to use the above, you'll need a 32-bit JVM. AFAIK there should be an Apple Java 5.0 32-bit for Snow Leopard (64-bit Cocoa) out there somewhere.
If you find it, please post a link to it here (with a statement of your success using JBT w/ 32-bit Cocoa XulRunner).
Thanks for the info! So what you are saying is I should use the 32 bit version of eclipse with the JBoss Tools nightly build loaded. I will also need to get Apple Java 5.0 32-bit...
If you can use Carbon, then there's a XulRunner Carbon 32-bit (for OSX 10.4+) available in M4, and the forthcoming RC1 (should be this week).
If you need Cocoa (32-bit only), then yes, you'll need the latest JBT 3.1 nightly.
In either case, you need to match Eclipse 32 with Java 32, or it won't run.
(You could also use something to virtualize Windows or Linux on your Mac and then run the win32 or linux.gtk (x86 or x86_64) versions... but I digress. :)