Firefox 3.5 Includes Web IRC Client
Firefox 3.5 the new release tag for the latest Firefox build, will include a IRC client called Mibbit, this will help you to connect to a desired server using a web interface when you click on a irc:// or ircs:// link on a page.

However, this behavior is not the default one and you will have to select it from the Applications page in the Options dialog for opening the clicked URL.
You can download the latest development version of Firefox 3.5 beta 3 from the Firefox beta page.
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Wow! :P Opera has it since May 12, 2004. Nice try Mozilla guys, here you have more ideas to get some “inspiration”
http://www.opera.com/docs/history/