Allow automatic import of Chrome Extensions

[stevennyman]

It would be cool if a list of extensions the user has installed in Chrome could be presented to them, and they could select which ones to install in Firefox all at once.

If filesystem access is a problem for this to work, maybe have the user sign into their Google account in Chrome and Firefox and then retrieve their list of owned Chrome extensions from https://chrome.google.com/webstore/user/purchases. Or maybe allow users to import a list of extensions generated via a Chrome extension, such as https://github.com/gabrielbarros/export-all-extensions?

I think this feature would make it significantly easier to move from Chrome to Firefox.