Your new Opera puts more power at your fingertips by adding special mouse button navigation and gesture recognition. First, press and hold the right button and then press the left button once or multiple times to go back. Do it the other way around to go forward. Second, press and hold the right button, and move the mouse to the left and release the button to go 'back'. You have just activated your first gesture command.
Opera contains similar gestures for activating other commonly used actions.
Read the Mouse gesture tips for a complete description of mouse-only navigation in Opera. Improved window handling Opera 5.11 includes an improved window system that integrates popups without interfering with your surfing experience. This will take care of privacy concerns when sharing a computer and Opera with others. The E-mail client in Opera 5.11 is more stable and better looking. It uses a new display engine, which is also shared with the news client.