Current versions of Firefox use the site identity button to give a visual indication of the security used by the site, for details see https://support.mozilla.com/kb/Site+Identity+Button

It is possible to make the background yellow, but it involves adding some code to a file called userChrome.css. For details on this file see http://kb.mozillazine.org/UserChrome.css

The code that you need to add below the line that begins with @namespace is:

#urlbar[level] .autocomplete-textbox-container {background-color: #FFB !important;}

For more details on editing this file see http://kb.mozillazine.org/Editing_configuration

For another site that gives a good overview of editing this file, see the top part of this link - http://www.linnhe2.free-online.co.uk/firefox/chrome.html

If the above posted code doesn't work then add -moz-appearance: none !important;

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

#urlbar[level] > .autocomplete-textbox-container {
 background-color: #FFB !important;
 -moz-appearance: none !important;
}

Be aware that Firefox 3 versions do not run on the Windows 98 platform that you used to post your question.

Firefox 2.0.0.20 is the last release that runs on the Windows 98 and Windows ME platform.

Win32: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/win32/en-US/

See also:

• http://kb.mozillazine.org/Installing_Firefox
• http://kb.mozillazine.org/Unsupported_operating_systems

I'm sorry it's taken me so long to respond to your suggestions. I haven't had the opportunity to access the computers in question for the last few days. Although your suggestions didn't work, I would like to assure you that I really appreciate the time & effort you took to try & help me & hope you will make another attempt. Being uncertain as to the proper syntax involved & how important a small difference might make, I tried the five variations of your suggestions below. None of them seemed to have any effect on the two systems. One system belongs to a relative & is a fairly new laptop running Windows 7. The other is an older desptop running XP. Do you try or test the suggestions you make?

@namespace is:

1. urlbar[level].autocomplete-textbox-container {background-color:
2. FFB !important;}

@namespace url:

1. urlbar[level].autocomplete-textbox-container {background-color:
2. FFB !important;}

@namespace url ("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

1. urlbar[level].autocomplete-textbox-container {background-color:
2. FFB !important;}

/* *@namespace url/* ("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

1. urlbar[level].autocomplete-textbox-container {background-color:
2. FFB !important;}

@namespace url
("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); 
/*only needed once*/
#urlbar[level].textbox-input-box {background-color:
#FFB !important;}

I'm not sure if the problem was that the response from cor-el that was emailed to me had some html elements mixed in with it or I was to stupid to realize that his suggestion had been corrupted or compromised. At any rate, the important thing is that it works now. Thank you, thank you, thank you!!! For anyone interested in making this change, the version that worked is: @namespace url ("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /*only needed once*/

1. urlbar[level] > .autocomplete-textbox-container {

background-color: #FFB !important;
-moz-appearance: none !important;

}