Opera 9.50 Beta 1

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Tabbed browsing, pop-up blocking, integrated searches and advanced functions.
The most full-featured Internet power tool on the market, Opera includes tabbed browsing, pop-up blocking, 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.

Changes Since Opera 9.23
Security:
Fixed an issue where external news readers and e-mail clients could be used to execute arbitrary code, as reported by Michael A. Puls II. See our advisory.
Fixed an issue where scripts could overwrite functions on pages from other domains. See the advisory. Issue reported to Opera by David Bloom.
  Opera 9.50 Beta 1