This is a revolving ticket which will be reopened prior to releases of the Add-on Builder that require a new version of the Add-on Builder Helper. At the time of release the ABH owner will push the updated version to AMO and mark the bug fixed.
Unassigning for now. I'm not able to get the builder (prod nor stage) to recognize that I have the helper installed. Maybe because I was on the nightly build? (I swear this worked earlier today though) Before the next Flightdeck ships, someone should probably do a round of testing against nightly, beta 7, beta 8 (nightly), and 3.6, to determine what's actually supported. Dbuc, let me know if you want edit access to http://bit.ly/fcGSFA, maybe doing something like that would help?
Oh, I think that's because of bug 610845, which itself is being blocked by bug 604641. I'll add the former as a dependency for this one.
That said, I believe that the ABH itself works with 4.0b8pre, but it's probably a good idea to wait until the whole SDK fully supports that release before building the official ABH with it.
The latest ABH now should be compatible with 4.0b7 and 4.0b8pre; once that's verified in bug 610845, we can upload this to AMO.