For the first time, Opera has released a 64-bit version of its browser, codenamed Wahoo (Opera 12 alpha) for both Windows and Mac users. This latest snapshot features HTML5 drag and drop, CSS animations, updated CSS transitions, and out of process plugins.
A biggest change to this new release is the inclusion of out-of-process plug-ins. Now, plug-ins is running in a separate process called Out of Process Plugins or OOPP. It gives Opera a level of protection from plug-in instability, which was one of the most common sources of browser crashes and freezes.
Moreover, the inclusion of Out of Process Plugins or OOPP means, you can run 32-bit plugins in a 64-bit browser.