$ apt-cache show ubufox | egrep '^(Desc| )'
Description: Ubuntu Firefox specific configuration defaults and apt support
Extension package for Firefox provides ubuntu specific configuration defaults
as well as apt support for firefox plugins/extensions.
You can uninstall this package if you prefer to use a pristine firefox
$ dpkg -L ubufox | grep searchplug
What does an Ask-specific search plugin have to do with Ubuntu-specific configuration?
(Before someone asks: I don't care about this from a Google-vs-the-world perspective -- please, go use Ask if you like it.)