Creating a search plugin for Firefox

You have probably used multiple search engines with Firefox's OpenSearch plugins. Many websites currently advertise their own search engines using the Autodiscovery method supported by Firefox. You can either add their search engines or you can find some custom ones on Add-ons for Mozilla.

However, sometimes you just need something different, something that fits your specific needs and can't be found anywhere else. In those cases, the best is to do it yourself.