Firefox 9.0.1 has been in the 11.10 repos since Dec 28 as several people are trying to tell you. It took Canonical 4 days including Christmas to give you this update, asking nothing from you in return.
Then the question you should be asking yourself is not "why isn't Ubuntu providing me with timely updates?" but "why is my system not up to date with the updates Ubuntu has so thoughtfully provided?"
Here is some basic reading material on software sources and the update manager:
https://help.ubuntu.com/community/Repositories/Ubuntu
https://help.ubuntu.com/community/InstallingSoftware
Personally here is my basic troubleshooting procedure for update related issues:
Code:
cat /etc/apt/sources.list
sudo apt-get update
sudo apt-get dist-upgrade
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