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.
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