An interface to various web caches or archivers (Google, Bing, Wayback Machine, archive.is). You can add another providers.
To show the menu with the list of web caches:
* Click the extension's icon in the browser toolbar next to the URL bar.
* Right-click on a link.
* Select text that resembles a URL on a web page, then right-click.
The extension is open-source and does not send your data anywhere.