Question | Firefox Help

The used search engine (that you must have installed) is set via the pref with the name browser.search.defaultenginename

You can specify the logo via code in userContent.css

http://kb.mozillazine.org/userContent.css

The customization files userChrome.css (interface) and userContent.css (websites) are located in the chrome folder in the user profile folder.

http://kb.mozillazine.org/Editing_configuration

@-moz-document url(about:home){
 #searchEngineLogo{ background-image:url(data:image/png;base64,<base64 data>); }
}

For the base64 image data, see:

[/questions/933343]

user_pref("browser.search.defaultenginename", "Bing");

@-moz-document url(about:home) {
#searchEngineLogo{
 background-image: url(data:image/png;base64,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);
}
}