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

Programs

Settings > 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 email; Opera's own built-in client, the default email client on your computer, or a specific other email 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 Page > Developer Tools > Source or press Ctrl+U to see the source of a webpage.

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