Sidebar extension boilerplate for Opera Quickly turn any responsively designed or mobile website into a sidebar extension for Opera. It takes only four simple steps: 1. Customize the extension name, description, and the URL in _locales/en/messages.js 2. Customize all the icons/*.png (square icons sized to match their filenames) 3. Drag manifest.js into the Extension Manager in Opera to test-install 4. Zip it all up and upload to addons.opera.com for users to download This is free and unencumbered software released into the public domain.