IE Browser Helper Object (Plug-in or toolbar)

Hello All,
I have just started to learn Visual C#. Could you kindly let me know if there's an easy way to develop toolbars or plug-ins for Internet Explorer (and, if possible, even for other browser like FireFox, Opera, etc.) in Visual C#
Thank you in anticipation,
rohit505



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IE Browser Helper Object (Plug-in or toolbar)