[Ctrl] +  to  – jump to tab numbers 1 to 8 or last tab (9)
Rather than scrolling through all your open tabs, you can quickly navigate to a specific tab if you know its position. For example, clicking [Ctrl] +  will open to tab number 4 (from the left). With [Ctrl] +  you will jump to the very last tab, no matter how many you have open.
[Ctrl] + mouse wheel – change font size
With the new generation high resolution screens we often find that text on websites is way too small to read properly. Here is a little trick that can quickly increase the font size for better reading.
While you hold down the control key, move your mousewheel to increase or decrease the font size in Firefox. This will also work in other programs, for example Word.
This is also very useful for making a website fit your window size, rather than to adapt the browser window.
[F11] – toggle full screen
Quickly change into full screen mode.
[SHIFT] + [Del] – bypass Recycle Bin
Selecting a file and pressing the combination above will invoke a delete confirmation dialog. Clicking ‘Yes’ will delete the file without sending it to the Recycle Bin.
[Windows] + [D] – show desktop or restore open windows
This is the keyboard shortcut to the respective quick launch taskbar icon.