How to write a web browser plugin for IE, Firefox and Chrome

I need to write a web browser plugin that supports IE 7+, Firefox 3+, Chrome.

This plugin should be able to host a DirectX object on a web page.

I have no experience with plugins.

I did some investigation and decided to do it with FireBreath.

• I could not figure out how to place the image inside the plugin area. Can anyone provide an example?

• How to place a DirectX object there? Any example?

• How to start an unattended installation?

Thank!

Sarah