Bug to track the remaining work to finish Credit Card Autofill to release it for en-US.

We will also want to re-evaluate the quality on top e-commerce websites for the countries we will support. See https://docs.google.com/spreadsheets/d/1dB0Fh3vTYNJL1M9_OWVnyQVKxTKOlANqKv9jdMMugjA/edit#gid=0 for the past results.

Since this will be the first use of OSKeyStore we need to ensure that the key storage (e.g. user-facing name for macOS: bug 1639795) are appropriate and we need to decide how we want to handle profile-per-install since that is new since the API was added. Since the security boundary is the OS account one key per application for the whole OS account is probably fine as long as we aren't deleting/changing the key from any code.

Nominating this for [wfh]. Thanks to COVID, lots more folks are ordering things online in order to avoid going out to get them. The lack of this particular table stake showed up in (at least) our last uninstall survey as a reason some people abandon firefox.