Chrome extension for showing a production ribbon when browsing through your production sites. It's language agnostic, just mark all your production sites and the ribbon will appear on all of them.
The idea (as well as the css code) was taken from the Ruby gem rack-dev-mark, used for showing a ribbon when on dev or staging environments.
1st way: Open chrome://extensions and drag and drop the the .crx file from a file explorer.
2nd way: Download the source code from here, open chrome://extensions, enable developer mode and select Load unpacked extension.