OpenSearch is an experimental cross-site search API for connecting subject-related and primarily database-driven community Websites. An example frontend exists and the sample backends distributed with this package can scan databases from PhpWiki, WordPress, ErfurtWiki, PostNuke/ PhpNuke, TikiWiki, and phpBB2, but are easy to adapt for other systems.
Firefox: del.icio.us/tag/firefox
Firefox
extensions
opensearch
system:has:via
opensearchfox
via:textundblog