During the initial research for my project, I discovered that Firefox 2.0 detects search engine plugins that may be manually added by the user to Firefox's search engine drop-down list. The user may then decide to select a particular search engine as the default for the browser's built-in search box. When Firefox detects a search plugin that has not yet been "Added" to the browser's list of search engines, the search engine icon and the drop-down list arrow of the browser's search box turn blue in colour.
Firefox allows JavaScript code to install search engine plugins, and supports two search engine plugin formats: OpenSearch and Sherlock. Firefox supports autodiscovery of search plugins , which enables a web site that offers a search plugin to advertise it, so that Firefox users can easily download and install the plugin. Any web site offering a search plugin must provide an OpenSearch description file, which is an XML file describing the search engine to the browser. To support autodiscovery of a search plugin, HTML code similar to the following line needs to be added to the
<link rel="search" type="application/opensearchdescription+xml" title="searchTitle" href="pluginURL">
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