Opera Software
  1. Toolbars
  2. Menus
  3. Panels
  4. Speed Dial
  5. Bookmarks
  6. Widgets
  7. Notes
  8. Opera Link
  9. Opera Turbo
  10. Content blocking
  11. Fraud Protection
  12. BitTorrent
  13. Display modes
  14. Developer tools
  15. Preferences
  16. Advanced Preferences
  17. Skins
  18. Keyboard shortcuts
  19. Using the mouse
  20. Using voice
  21. E-mail and news
  22. Feeds
  23. Chat
  24. Dialogs
  25. Auto-update
  26. Backing up Opera

Programs

Preferences > Advanced > Programs

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Choose which programs Opera should use to handle specific protocols.

Protocol manager

You can create your own list of programs to launch when executing particular protocols in Opera. The default list includes:

Protocol Purpose
mms Choose which application Opera should use to display MMS streams
rtsp Choose which application Opera should use to display RTSP streams
mailto Choose which application Opera should use for e-mail; Opera's own built-in client, the default e-mail client on your computer, or a specific other e-mail client.

You can ask Opera to make sure at each start-up that it is the default browser on your computer.

Source viewer

The source viewer is the program you want to launch when you select View > Source or press Ctrl+U to see the source of a Web page.

By default, Opera will use its own built-in source viewer.