/usr/lib/firefox-addons/searchplugins/launchpad-packages.xml is in firefox-launchpad-plugin 0.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | <SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
<ShortName>Launchpad Ubuntu Package Search</ShortName>
<Description>Perform a search in Ubuntu Packages on Launchpad</Description>
<InputEncoding>ISO-8859-1</InputEncoding>
<Image width="16" height="16">data:image/x-icon;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAYAAAAfSC3RAAAABmJLR0QA/wD/AP+gvaeTAAAAB3RJTUUH1goWBRURbL9BfQAAAP1JREFUKJGdzzFKA0EUxvH/rrtZY8SkyrqsaGNvaWGjhQcIpFQQcgjBA4h30dZK0EK0EAJ6AIOIoJYRZWZ2nImVo8hkFvyqB48f33vwz0Tfw0E/l0BWBw5PXiMH93vdtdZcdrW9tdGKouno7OL6/UPpzaPj52ECkKXx7kpZNOynQIuxF6XNNstLRTYaPewAwxhgQjQoyzw1Wk5tM1pQFt3UEu8BJADG2s7qeh8t34L/pbMLnF/edBwEeLw7RYxfgrDZXnSzg6qyyMoEYVxZD9SmFs7on72DsjIIVQMrH9QWUdOYaO+pFvnrB18aXqgM2XwehEp5Tn26vw2iv/kCPghioGIxXYsAAAAASUVORK5CYII=</Image>
<Url type="text/html" method="GET" template="https://launchpad.net/distros/ubuntu/+search">
<Param name="text" value="{searchTerms}"/>
</Url>
<SearchForm>https://launchpad.net/distros/ubuntu/+search</SearchForm>
</SearchPlugin>
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