Since Grooveshark's upgrade, the old search plugin no longer points to the correct URL scheme. Until they update the plugin, this one will work. It is essentially their litesearch.xml but with the URL updated.
If you think this add-on violates Mozilla's add-on policies or has security or privacy issues, please report these issues to Mozilla using this form.
Please don't use this form to report bugs or request add-on features; this report will be sent to Mozilla and not to the add-on developer.