You can enlarge the text on any Web page by pressing Ctrl and the plus or minus keys (for bigger or smaller fonts).

You can also enlarge the entire Web page by pressing the Ctrl key as you turn the wheel on top of your mouse.

You can tap the Space bar to scroll down on a Web page one screenful. Add the Shift key to scroll back up.

If you hit the Ctrl and Home key on your keyboard you will immediately be taken to the top of the web page, document, or email.

Hitting the Ctrl and End key on your keyboard at the same time will take you immediately to the bottom or end of a web page, document, or email.

Source : SharePoint Knowledge Base