CTAN has a new package: Search-Plugin for Firefox

[CTAN announcements (Jim Hefferon, tug.ctan.org)]

This package has been installed at tug.ctan.org and should within a day be
at your local mirror.
 
Thank you,
Jim Hefferon
Saint Michael's College

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Name: firefox_ctan_plugins
Author: Martin Engler
See: http://www.ctan.org/tex-archive/support/firefox_ctan_plugins
Description:

I've created the two attached Firefox search-plugins. These may be  
useful to other users as well.
How to embed them:
https://developer.mozilla.org/en/Creating_OpenSearch_plugins_for_Firefox#Autodiscovery_of_search_plugins