Firefox,one of the popular web browser has many shortcut keys which makes the life of Web-surfer much easier. Below is a collection of one of most favorite of mine :
Zoom in a Webpage Ctrl Key with + Key
Zoom out a Webpage Ctrl Key with – Key
Zoom Reset Press Ctrl Key with 0 Key
Open a new Tab Ctrl Key with T Key
Close a Tab Ctrl Key with W Key
Reopen a closed Tab Ctrl Key with Shift Key with T Key
Move cursor to Address bar Ctrl Key with L Key
Move cursor to search box Ctrl Key with K Key
Scroll down the page Spacebar
Scroll up the page Shift key with Spacebar
Refresh the page Ctrl Key with K Key (Good Ol’ F5 works too.)
Navigate to Back Page Alt key with Left_Arrow Key
Navigate to Forward Page Alt key with Right_Arrow Key
Search a keyword in page / Key does the trick (Although Ctrl with F works as well)