<searchplugin xmlns="http://www.mozilla.org/2006/browser/search/" xmlns:os="http://a9.com/-/spec/opensearch/1.1/">
<os :shortname>Google Code</os>
<os :description>Search Google Code</os>
<os :inputencoding>UTF-8</os>
<os :image height="16" width="16">data:image/png;base64,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</os>
<updateinterval>7</updateinterval>
<searchform>http://www.google.com/codesearch</searchform>
<os :url template="http://www.google.com/codesearch?q={searchTerms}" method="GET" type="text/html">
</os>
</searchplugin>
 

Download

google code search plugin for FireFox

Installation

Put just downloaded XML file to the directory under the next path:

in Windows – %AppData%\Mozilla\Firefox\Profiles\%FirefoxProfile%\SearchPlugins\

in Liunx – ~/.mozilla/firefox/%FirefoxProfile%/SearchPlugins/

in Mac – ~/Library/Application Support/Firefox/Profiles/%FirefoxProfile%/SearchPlugins/

where

%AppData% – current user Application Data directory under his home directory, e.g. C:\Documents and Settings\User\Application Data\ in Windows XP, Server 2003 and C:\Users\User\AppData\Roaming\ in Windows Vista, Windows 7 and Server 2008

%FirefoxProfile% – current Firefox profile directory, e.g. 1ab2cdef.default

Reference: http://godfather.net.ru/software/firefox/search/Installation.aspx