Well I found a better solution. KiwiIRC web client. It's opensource and it's written in javascript and it works with any browser/server. If anyone is in the same situation as me just use that.

I would like to connect to efnet server because the channel is already created and there is a bot on this server I would like to use. If one of the admins has the time, it'd be pretty awesome to have efnet be compatible with a lightirc. I guess you can move this to suggestions if there isn't any tha...

Is there any efnet server running a flash policy server? I'd like to use Lightirc web client but it needs it.