What does the Ubuntu Firefox Modifications extension to firefox do?

I'm presently running Firefox 3.6.8 on Ubuntu 9.04. My Firefox extensions include Ubuntu Firefox Modifications 0.9rc2. I've upgraded Firefox on this install a few times; as far as I can recall, some version of this extension was present when I initially installed Ubuntu 9.04. I have disabled it, mostly because I didn't know what it provided me, nor was I able to find out when I tried a bit.

What does the extension do?

It came with xul-ext-ubufox :

Ubuntu-specific configuration defaults and apt support for Firefox.

Adds Ubuntu-specific modifications to Firefox.

Integrates the browser with Ubuntu to:

• Enable searching for missing plugins from Ubuntu software catalog
• Add the following options to the Help menu:
  • Get help on-line
  • Help translating Firefox
  • Ubuntu Release Notes
• Set homepage to Ubuntu Start Page
• Display a restart notification after upgrading Firefox
• Add ask.com to the search engines.

You can uninstall this if you prefer to use a pristine Firefox install.

Homepage: https://launchpad.net/ubufox

The files here show some of the changes that Ubufox provides (custom branding, search preferences, etc.)

http://bazaar.launchpad.net/~mozillateam/ubufox/trunk/view/head:/defaults/preferences/ubuntu-mods.js

It enables Firefox addons to be installed through the package manager.