Topic: Userscripts.org discussion / userscripts.org firefox search engine

Just download a search-engine xml from https://addons.mozilla.org/en-US/firefox/browse... and modify the xml, here a copy of the ask search-engine

<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/"
                       xmlns:moz="http://www.mozilla.org/2006/browser/search/">
  <!-- Created on Tue, 17 Jul 2007 21:17:31 GMT -->
  <ShortName>Ask.com</ShortName>
  <Description>Get more with each search.</Description>
  <Url type="text/html" method="get" template="http://www.ask.com/web?q={searchTerms}&amp;qsrc=145&amp;o=ffx"/>
  <Url type="application/x-suggestions+json" template="http://ss.ask.com/query?q={searchTerms}&amp;li=ff"/>
  <Image width="16" height="16">http://mycroft.mozdev.org/updateos.php/id0/ask16x16.ico</Image>
  <Developer>Valerie Lanard</Developer>
  <InputEncoding>UTF-8</InputEncoding>
  <moz:SearchForm>http://www.ask.com</moz:SearchForm>
  <moz:UpdateInterval>7</moz:UpdateInterval>
</OpenSearchDescription>

Edit:

Here some more links:
http://developer.mozilla.org/en/docs/Creating_O...
http://msdn.microsoft.com/en-us/library/bb93108...
http://snippets.dzone.com/posts/show/2910
http://code-inside.de/blog-in/tag/opensearchdes...