There are other bugs related to Maemo support including
https://bugzilla.mozilla.org/show_bug.cgi?id=653201 (cant tell what version that was removed in)
https://bugzilla.mozilla.org/show_bug.cgi?id=1080529 (although that looks like a website change rather than a code change so we can ignore it)
and https://bugzilla.mozilla.org/show_bug.cgi?id=648156 (which looks like it was removed in Firefox 5.x so long before the build of FF we need to be worried about, this one looks like the important one)

And there may be other bugs in there that I haven't found yet that are relavent to us.