Firefox

Keyboard Shortcuts
Highlight the address bar = F6

Reset FF to factory defaults
The easist way is to close all instances of firefox, then goto

Start>program files>Mozilla FireFox>Mozilla Firefox (Safe Mode)

Delete Browsing History (Cache, Temp files) Ctrl+Shift+Del.

 * 1) Click Tools 
 * 2) Click Select Recent History
 * 3) Change Time range to Everything and select Cookies and Cache
 * 4) Click Clear Now

Check for proxy server

 * 1) Click Tools then Options
 * 2) Select the Advanced tab then select the Network sub-tab
 * 3) Under the Connection heading click the Settings... button
 * 4) The No proxy radio button should be selected