Cross extension web3 APIs

[Jack-Works]

Now Metamask provides web3 on the web page for dapps, but it is not accessible from other browser extensions.

Does MetaMask public it's JSON RPC API at the browser extension level to enable cross extension communication? I didn't see that in the documentation.

Our use case:

Maskbook is a browser extension that allows encryption on Facebook and Twitter. The following screenshot is fund Gitcoin grants in Maskbook. Now Maskbook has a built-in eth wallet but it will be nice to call MetaMask to do the payment.

[jennypollack]

See: MetaMask/extension-provider#3 (comment)
and https://github.com/MetaMask/metamask-extension-provider
Basically it should work, but none of us have had the time to test it ourselves yet - would be awesome if you could give it a go and let us know!

[rekmarks]

Hi @Jack-Works, one more thing: you should stop using window.web3, as we will stop injecting it later this year. You should use window.ethereum instead, and bring your own library dependencies. We recommend ethers, but you can also bring your own web3.

[Tedko]

Updates on our side:

would be great if you have any idea on this MetaMask/extension-provider#9 as well. Many thanks.