Most Useful:

• alt + D

  This sends focus to the address bar and highlights the current URL. Very handy to copy, start typing from scratch or when pasting in a new location.

• ctrl + t

  New, blank tab.

Coolest:

• ctrl + Mouse Scroll Button

  Increases or decreases text size.

Firefox Keyboard Shortcuts
Command	Keyboard Shortcut
Add Bookmark	Ctrl+D
Back	Backspace Windows Alt+Left Arrow
Bookmarks	Ctrl+B Ctrl+I
Caret Browsing	F7
Close Tab	Ctrl+W Ctrl+F4
Close Window	Ctrl+Shift+W Alt+F4
Complete .com Address	Ctrl+Enter
Complete .net Address	Shift+Enter
Complete .org Address	Ctrl+Shift+Enter
Copy	Ctrl+C
Cut	Ctrl+X
Decrease Text Size	Ctrl+-
Delete	Del
Delete Individual Form Auto-Complete Entry	Shift+Del
Downloads	Ctrl+Y
Find Again	F3 Ctrl+G
Find As You Type Link	'
Find As You Type Text	/
Find Previous	Shift+F3
Find on page	Ctrl+F
Forward	Shift+Backspace Windows Alt+Right Arrow
Full Screen	F11
History	Ctrl+H
Kill End Of Line	Ctrl+K Linux
Increase Text Size	Ctrl++
Move to Next Frame	F6
Move to Previous Frame	Shift+F6
New Tab	Ctrl+T
Next Tab	Ctrl+Tab Ctrl+PageDown
New Window	Ctrl+N
Open File	Ctrl+O
Open Address in New Tab	Alt+Enter
Page Info	Ctrl+J Windows Ctrl+I Linux
Page Source	Ctrl+U
Paste	Ctrl+V
Previous Tab	Ctrl+Shift+Tab Ctrl+PageUp
Print	Ctrl+P
Read Mail	Ctrl+M
Redo	Ctrl+Shift+Z Ctrl+Y
Reload	F5 Windows Ctrl+R
Reload (override cache)	Ctrl+F5 Ctrl+Shift+R
Restore Text Size	Ctrl+0
Save Page As	Ctrl+S
Select All	Ctrl+A
Select Location Bar	Alt+D F6 Ctrl+L
Select Next Search Engine in Search Bar	Ctrl+Down
Select Previous Search Engine in Search Bar	Ctrl+Up
Select Tab [1 to 9]	Ctrl+[1 to 9]
Stop	Esc
Undo	Ctrl+Z
Web Search	Ctrl+E Ctrl+K Windows Ctrl+J Linux