because of the changing release and focus changes within the Mozilla project, (it's likely that) Mozilla XULRunner won't be maintained anymore. Therefore we are going to ship a pretty static Firefox again (even with libmozjs compiled into the the big xul blob).
In the past some people expressed interest to have a decent standalone JS interpreter library available for linking into certain packages. With the above mentioned changes it's now time to create that one instead of exposing the xulrunner included one.
I've prepared an initial Spidermonkey (JS 1.8.5 as included in Firefox 4) package in mozilla:Factory and propose to add it to Factory.
It would be nice to get some feedback from maintainers who could make use of it if it works for them as currently packaged or if there are any changes needed. Also please tell me if it's not needed at all in case ;-)
PS: I'm not going to use that as base for the Mozilla applications for some reasons though.