A few Ubuntu & Firefox tips and tricks

Hello! Folks.

Here are some tips for the users of Ubuntu and Firefox.
Gnome 2.x: Supercharge your right-click menu with Nautilus Scripts
Gnome:Add screen actions with Brightside
Gnome/KDE:Dock any application to the system tray with AllTray
Gnome on Linux:Copy and paste without using the clipboard
Gnome:Embed the terminal on the desktop
Linux: Speed up Gnome menu
Ubuntu: How To: Give Ubuntu a speed boost
Ubuntu:Print to PDF in Ubuntu
Ubuntu:Encrypt CDs/DVDs in Ubuntu
Ubuntu:Load programs faster with Preload
How To: Create .iso disk images and generate MD5 checksums

Firefox: Tweak about:config options with Configuration Mania
Firefox on Ubuntu:Beautify Firefox web page forms on Ubuntu

Thanks Lifehacker.
Happy tweaking.