Here is a slight modification to Joan Piedra’s jQuery greasemonkey script that loads the jQuery library on any page you visit. This gives you the power of jQuery when using Firebug or Greasemonkey. Here is an example of its usage.
Make sure that the jquery.user.js script is loaded before any other dependent Greasemonkey scripts.
The difference is you can put the jQuery library into the script itself. This causes the page to load faster and does not use up John Resig’s bandwidth. Unfortunately, this also means you will need to manually upgrade your greasemonkey script when the next version of jQuery comes out.
[Update] Edited the Greasemonkey script to make jQuery compatible with other js libraries.
[Update] Pointing to userscripts.org
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