Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project! See Demo
They suggested that I report the bug here instead of on launchpad. Easiest way was to post a link to the Launchpad report.
So... it looks like you used the ubuntuzilla script to install, rather than the repository.
The script is no longer supported - instead there's an actual repository of packages on ubuntuzilla (see latest instructions on the ubuntuzilla site)
To fix your problem, just run the ubuntuzilla.py remove process on firefox, then install package firefox from the ubuntu repositories as normal.
This Tracker item was closed automatically by the system. It was
previously set to a Pending status, and the original submitter
did not respond within 14 days (the time period specified by
the administrator of this Tracker).