Learn the shortcuts is a browser extension that helps you discover and start using the keyboard shortcuts available in some web applications
For now, it works for the most useful shortcuts in Gmail, Google Calendar, Trello, and Github.
Learn the shortcuts is currently available as an extension for Firefox and Chrome.
Just press and hold alt on a supported website and an overlay will show you all the keyboard shortcuts you can use.
Note: Keyboard shortcuts are not enabled by default in Gmail and Google Calendar. You'll need to enable them by going to Settings > General > Keyboard shortcuts
Feature suggestions, bug reports, and pull requests are welcome.