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 "Code" button above, then "Download ZIP"
Unpack the archive
Go to opera://extensions
Toggle "Developer Mode" at the top if it's not active
Click "Load Unpacked"
Navigate to the previously extracted archive, and then to "web-panel-extension"
Click "Open"