The Opera web browser consists of two components, a platform independent core (or rendering engine), and a user interface component. Opera share the same user interface across all mainstream desktop platforms such as Windows, Mac and Unix systems, minor differences can still be found between them though. On other devices such as mobile phones, TVs, interfaces are typically smaller and less feature rich.

Most of the security mechanisms in Opera are focusing on SSL and scripting.

SSL related

Scripting related

Miscellaneous