since this came up on the ESR list now several times, it would be great to have content in the faq how to differentiate between the general release and vanilla version. i guess would be cool to have that in the faq section or wiki page, since this questions might come more often
This is what I wrote to the list on the matter: The only way to distinguish between the two versions these days is through the application.ini file. The SourceRepository field in the [App] section will be "http://hg.mozilla.org/releases/mozilla-esr10" for this line of ESR builds. (When we start the next line of ESR at Firefox 17 this will change, of course.) The version you're looking at isn't used by us at all. The only thing we do is guarantee that it doesn't go backwards.
This is actually explained in the Enterprise Working Group (EWG) mailing list, but it would nice to have the same explanation in the ESR release notes.