We’re excited to announce that we launched Flask: an experimental playground for developers, where new or proposed features will be rolled out and tested before being deployed to the broader public.

The first one of these features is Snaps. Snaps allows developers to expand the functionality of MetaMask at runtime, without our involvement. Just build a snap, tell your users about it, and make MetaMask work the way you want it!

Be warned: the use of Flask is at your own risk.

You can find out more in our blog post or go straight to the developer documentation. Prefer to watch a video? Watch the demo. Play with a demo. Can’t get enough? Check out our discussion board, chat on Reddit, and last but not least, install Flask.

An example: with Snaps, a developer can add new non-EVM-based networks like Filecoin.

See: https://filsnap.chainsafe.io/