= phenomenon =
tg_absolute_url is broken in the current python-fedora (probably been broken since we updated to TG-1.1 [RHEL6]). it's adding csrf_tokens even though it's not supposed to.
Among other things, this breaks the pkgdb opensearch plugin for firefox.
Applied this fix as a hotfix:
http://bzr.fedorahosted.org/bzr/python-fedora/devel/revision/838
This fix was deployed in fedora-packagedb-0.5.5-1.el6 and the hotfix dropped.