Browser addon development

Are there any good websites for instructing how to write browser addon for IE, firefox, chrome and Safari?

No开发者_Go百科t sure whether writing there is some frameworks which can be used to write addon for all major browsers such that one sourcecode for all major browsers.

Thanks.

IE and Firefox have very different plug-in models. IE supports binary helper objects (your native code running in IE's processes). Here’s how you can build one: http://blogs.msdn.com/b/ie/archive/2008/04/04/designing-for-add-on-performance.aspx, here’s why you should spend as little of your users’ time as possible in your code: http://blogs.msdn.com/b/ie/archive/2011/03/23/updates-to-add-on-performance-advisor.aspx