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/Extensions

http://roachfiend.com/archives/2004/12/08/how-to-c...

http://juicystudio.com/article/firefox-table-inspe...

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

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