This post has been posted with the following monster:
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1) Gecko/20090629 Iceweasel/3.0.11 (Debian-3.0.11-1)
For those not following or not very much aware of what it means, this is Iceweasel/Firefox 3.0 using the engine from Iceweasel/Firefox 3.5. And except a few components, it seems to work fine. And the demos for Firefox 3.5 from hack.mozilla.org all work as expected.
The xulrunner 1.9.1 package I’m using still needs more polishing before upload, though.