This is the list of the most useful Firefox keyboard shortcuts. It is amazing how much more efficient you can be when your not always reaching for your mouse.
Controlling Tabs
New Tab – Ctrl+T
Close Tab – Ctrl+W or Ctrl+F4
Next Tab – Ctrl+Tab or Ctrl+PageDown
Previous Tab – Ctrl+Shft+Tab or Ctrl+PageUp
Select Tab [1 to 9] – Ctrl+[1 to 9]
Searching Text
Find in This Page – Ctrl+F
Find Again – Ctrl+G or F3
Find Previous – Ctrl+Shft+G or Shft+F3
Other Commands
Full Screen – F11
Reload – F5 or Ctrl+R
Reload (override cache) – Ctrl+F5 or Ctrl+Shft+R
Select All – Ctrl+A