Firefox Desktop OSs about:config Modifications

In the following examples you will need to access Firefox's hidden configuration page by setting in the address bar type 'about:config' (without the '') and press 'Enter', then click the 'I'll be careful, I promise' button.

Address (URL) Bar Search Provider - Change: How To
 Config name: keyword.URL Default: blank Modified value: http://www.google.co.uk/search?&q=  The above example is for Google UK but there are other search engines, however they do not all use the same format. If for instance you wanted to use Microsoft's Bing you would need to use the following:

http://www.bing.com/search?ie=UTF-8&oe=UTF-8&sourceid=navclient&gfns=1&q=

Address (URL) Bar - Select All Text With One Click: How To
 Config name: browser.urlbar.clickSelectsAll Default: false Modified value: true 

Double click to toggle the value.

AwesomeBar: Change The Amount Of Results Returned (v3 >)
The "AwesomeBar" allows you to do a keyword search of your bookmarks, tags and browsing history by typing in the address window. As you start typing in the address bar the AwesomeBar shows you a list of a dozen suggestion, this tweak allows you to set a higher or lower number of returns.

 Config name: urlbar.maxRichResults Default: 12 Modified value: 6 

Double click and alter to your choice.

Backspace Button - Change Behaviour: How To
 <li>Config name: browser.backspace_action <li>Default: 2 (does nothing) <li>Modified: 0 (go back previous page) <li>Modified: 1 (page up) </ul>

Double click and alter to your choice.

Blinking Text - Disable: How To
If you get annoyed by text on website that blinks at you this tweak overrides the site settings and stop the behaviour.

 <li>Config name: browser.blink_allowed <li>Default: true <li>Modified: false </ul>

Double click to toggle the value.

Extension Install Delay - Alter Or Disable: How To
 <li>Config name: security.dialog_enable_delay <li>Default: 2000 <li>Modified: 0

Double click and alter to your choice. A value of '0' disables any delay.