Coding Web Browser Toolbars?

Does anyone have any experience coding web browser toolbars? I've used Conduits website to create browser toolbars but I don't like how I'm forced to use their advertising based search and I don't like their terms of service, it seems like they are sending to much information about my browsing history. I'm trying to code this toolbar for use by my company and they arn't confortable with a 3rd party designed toolbar for security reasons. Has anyone coded their own toolbar for IE and/or Firefox and if so what coding language are you using and do you know of either any web or paper references I could read for help.





Thanks in advance!Coding Web Browser Toolbars?
I haven't done any development yet, but I was researching this for IE last week, these are the links I found:





http://del.icio.us/robertc64/IEExtension





Firefox is a lot easier, as you basically write extensions in HTML and Javascript. If you download an extension .xpi file you can extract it with WinZip or similar and look at the code (change the extension to be .zip if you run into trouble). In addition there are a number of tutorials on the web:





http://developer.mozilla.org/en/docs/Ext鈥?/a>


http://roachfiend.com/archives/2004/12/0鈥?/a>


http://juicystudio.com/article/firefox-t鈥?/a>


http://www.rietta.com/firefox/