Chrome extension identity.email empty

In addition to having the identity.email permission, as posted in the related Chrome issue for this subject, users must have their profile syncing turned on under chrome://settings -> People -> Sync for their ID and email to show up using chrome.identity.getProfileUserInfo.

The getProfileUserInfo documentation says:

• email: Empty if the user is not signed in or the identity.email manifest permission is not specified.
• id: Empty if the user is not signed in or (in M41+) the identity.email manifest permission is not specified.

Edit manifest.json to include both permissions:

"permissions": ["identity", "identity.email"]