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In xulrunner-7.0-1.fc17, xulrunner is installed under %{_libdir}/xulrunner-2, not %{_libdir}/xulrunner-7.
Or %{_libdir}/xulrunner which is the same manner as firefox and thunderbird.
We keep the directory for compatibility and preferences reason (you can put your preferences to the xulrunner dir and they won't be overridden). Why should be change the xulrunner dir with the new versions?
According to https://developer.mozilla.org/en/Gecko Firefox 13 and Thunderbird 13 are based on Gecko 13. If we need compatibility, we can make xulrunner-2 symlink to xulrunner-13. However I don't know Gecko 13 has really compatible with Gecko 2.