The settings inallow you to set up external applications that Opera can use to enhance your browsing experience.
Plug-ins are external applications that Opera can use to display images and video clips, show files, or play sounds that the browser is not able to handle by itself. Some of the most popular plug-ins are Adobe Flash Player, QuickTime, and Adobe Acrobat.
To see a list of installed plug-ins, open the built-in plug-in overview. Note that Opera for Linux has a separate preference window for installing and locating plug-ins.
For more information, see the Plug-ins document online.