Browsers
Common shortcuts that work in most browsers
A printable list of common shortcuts can be found below
Move back and forth through previous web pages - Alt + left or right arrow
New Tab - Ctrl + T
Bookmarks - Ctrl + D
History - Ctrl + H
Detailed browsing history - Ctrl + Shift + H
Use this to get a pop up window that will allow you to see not only the history but your bookmarks as well
Close window - Ctrl + W
This will close the top most window
Return a closed tab - Ctrl + Shift + T
Reopen closed Window - Ctrl + Shift + N
Zoom
Ctrl + mouse wheel up or down or Ctrl + (+/-)
Ctrl + 0
Reload page
F5 or Ctrl + R
Cycle through tabs -
Firefox
CTRL + SHIFT + PgDn / PgUp
Chrome
CTRL + SHIFT + TAB