using the Mozilla Firefox XML search plugin extension system, the BeebleX.com search plugin installs into your Mozilla browser to allow you to quickly search for PHP-related information at BeebleX.com, the PHP search engine. The one-click installation takes seconds to perform, adding an extra drop down icon to the search box in your browser. You can then search BeebleX immediately by typing a search query into the bar.
Search Scripts
greasemonkey user scripts! For the uninitiated, greasemonkey is a Firefox extension that lets one modify a web page with javascript in powerful ways. This means that to install the user script, you must first install the greasemonkey extension, and then the script into it. The script recieves new features first, and sometimes only, and there are a lot of other fantastic user scripts to do amazing things like this, so I suggest you use greasemonkey