and will not work with older versions.
See here http://dev.eclipse.org/mhonarc/lists/atf-dev/msg00600.html

Is it time for us to move on XR1.9?
do we have a way to fix the missing features in XR1.9 ?
I recall last time that drag'n'drop and selection were affected ?
DnD has been working normaly, as i remember.
Selection has been affected only on
OSX(https://bugzilla.mozilla.org/show_bug.cgi?id=368608) and workaround
What is that workaround ? I couldn't spot it in the comments.
What does ATF do ?
What does it mean, is it about which functionality have atf?
They also depend on similar features of xulrunner that we do - if they already fixed some thing we can reuse if
it makes sense or if they fixed it bad not how to do it.

Anyhow, I went back through the archives and found the following issues to be what we have discussed before:

1) The Selection area as described above. If that only affects Mac and there is a maintainable workaround that should be fine.

2) Platform availability - can we get or produce a xulrunner 1.9 binary for all our supported platforms ? x86_64 bit ? Mac Cocoa/Carbon ?

3) Updatability - will users (of both jboss tools and JBDS) be able to update to xulrunner 1.9 via our updatesite  without conflicts to the SWT integration/hook/hack ?

If we can solve/verify these or at least find acceptable workarounds and there isn't any other known problems then lets move to XulRunner 1.9 after M3 have been released.