Crtl + W
Quick Exit.

Ctrl + U
Find Source.

Ctrl + L
Select URL in Address Box.

Ctrl + Mouse Wheel Up/Down
Zoom in and out.

Ctrl + S
Save at Directory.

Ctrl + A
Select All.

Ctrl + B
Open Bookmarks.

Ctrl + H
Open History.

Ctrl + Z
Go To Last Saved Point.

Alt + F4
Quickly Shutdown FireFox.

Ctrl + N
New Firefox Window.

Ctrl + J
Show Downloads.

Ctrl + T
New Tab.

Ctrl + Shift + W
Close Firefox window (The Same As Alt + F4)/

F11
Fullscreen View.

Ctrl + Shift + Delete
Clear Private Data.

Ctrl + D
Bookmark Current Page.

Ctrl + K
Web Search.

Ctrl + R
Reload Current Page Or Tab


Sorry If These Have Been Posted Before, I Haven Seen Them Around Though.
Enjoy