run greasemonkey scripts in all browsers

* Greasemonkey, an extension for Firefox. Make sure to restart the browser before trying to add the script.
* Trixie, one of the best Greasemonkey-like plug-ins for Internet Explorer
* SIMBL and GreaseKit for Safari
* no additional software for Opera, but you need to enable the feature from Opera's interface
* Konqueror Userscript for Konqueror