Web Panel

Web Panel is an Opera sidebar extension. It allows you to visit web pages in the sidebar, and adds basic functionality like bookmarks.

Installation

The regular way (stable)

From github, development version (unstable)

Click the green "Clone or download" button, then "Download ZIP".
Unpack the archive
Go to opera://extensions
Click "Developer Mode" at the top
Click "Load Unpacked Extension..."
Navigate to the previously extracted archive, and then to "web-panel-extension"
Click "Open"