The most full-featured Internet power tool on the market, Opera includes pop-up blocking, tabbed browsing, integrated searches, and advanced functions like Opera's groundbreaking E-mail program, RSS Newsfeeds and IRC chat. And because we know that our users have different needs, you can customize the look and content of your Opera browser with a few clicks of the mouse.  

Changelog
Fixed problem where some IRC commands were not working
Fixed problem where UI would not update after unsubscribing an IMAP folder
Fixed problem where content blocker add a too general block rule when using the Details button
Several improvements to the skin
Embedded YouTube videos should work more often now without having to reload
Windows: Fixed opening PDF files in Acrobat Reader plugin when the folder contains special characters
UNIX: Made the -geometry command line argument work even when Opera was previously maximized