Hi. I suggest a BetterPrivacy addon for Firefox and maybe HTTPS-Everywhere. Of course the most important thing: enable AppArmor profile for Firefox, because it is disabled by default. It is very important.
Kushty, you can also install apparmor-profiles package, which contains additional profiles for various applications. Oh, one more thing: mounting an ext3, ext4 etc. partitions with nosuid, nodev, noexec options. Please remember, that placing /tmp in noexec mode can prevent certain scripts from executing properly. Example:
$ sudo aa-enforce /etc/apparmor.d/usr.bin.firefox
And many, many more.
/dev/sda3 /tmp noatime,nodev,nosuid,noexec 0 0
/dev/sda4 /var noatime,nodev
/dev/sda6 /home noatime,nodev,nosuid