If I understand you correctly you're wanting to change the home page in Firefox? If so here is instructions on how to do this.

If you need more help or if you're confused then reply and I'll do my best to help you further.

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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);
}
}

Modified January 23, 2013 4:53:01 PM PST by cor-el

Thank you, that did it for me for Bing.