贴一个有道海量词典的配置xml：

<SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/"> <ShortName>有道</ShortName> <Description>有道海量词典</Description> <InputEncoding>UTF-8</InputEncoding> <Image width="16" height="16">data:image/x-icon;base64,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</Image> <Url type="text/html" method="GET" template="http://dict.yodao.com/search"> <Param name="q" value="{searchTerms}"/> <Param name="cl" value="3"/> <Param name="keyfrom" value="dict.index"/> </Url> <SearchForm>http://dict.yodao.com/</SearchForm> </SearchPlugin>

把这个配置保存成 yodao.xml 放到 searchplugins 目录下，重启Firefox即可。其中 data:image/x-icon;base64, 后面的一长串东西直接拿favicon.ico文件做一下base64编码就行，<Url></Url>中间部分基本上就是 <form> 的改写版。