Stop all the ads that follow you around the net
By periodically running a script such as this:
$ sudo apt-get install sqlite3
$ cat ~/bin/clean-cookies.sh
#!/bin/sh
sqlite3 $HOME/.mozilla/firefox/*.default/cookies.sqlite « EOF
delete from moz_cookies where not (host like ‘%youtube%’ or host like ‘%google.com%’ or host like ‘%facebook%’);
.quit
EOF
Tested on Ubuntu 11.10 + Firefox9.
