Mozilla Firefox Keyboard Shortcuts

Ctrl + N                                        :     Open New browser window.
Ctrl + P                                         :     Print current page / frame.
Ctrl + T                                        :     Opens a new Tab.
Ctrl + F4 or Ctrl + W                  :     Closes the currently selected tab.
Ctrl + Shift + W or Alt + F4        :     Close the current window.
Ctrl + Shift + T                            :     Undo the close of a window.
Ctrl + Tab or Ctrl + Page Down  :     Go to next Tab(Left to Right).
Ctrl + (1 to 8)                               :     Select Tab from 1 to 8.
Ctrl+9                                           :     Select Last Tab.

Ctrl + Shift + Del                         :    Open the Clear Data window to quickly clear private data.
Ctrl + D                                        :     Add  Bookmark for the page currently opened.
Ctrl + I                                         :     Display available bookmarks.
Ctrl + J                                         :     Display the download window.
Spacebar                                      :     Moves down a page at a time.
Shift + Spacebar                          :     Moves up a page at a time.
Alt + Down arrow                        :     Display all previous text entered in a text box and/or available options on Drop down menu.
Alt + Left Arrow                          :     Back a page.
Backspace                                    :    Back a page.
Alt + Right Arrow                        :     Forward a page.
F5                                                  :    Refresh current page, frame, or tab.
F11                                                :    Full screen mode.
Esc                                                :    Stop page or download from loading.
Ctrl + (- or +)                                :    Increase or decrease the font size, pressing '-' will decrease and '+' will increase.
Ctrl + Enter                                  :    Quickly complete an address. For example, type google in the address bar and press CTRL + ENTER to get http://www.google.com.
Shift + Enter                                 :    Complete a .net instead of a .com address.
Ctrl + Shift + Enter                      :    Complete a .org address.