Pre WebExtensions: 5/5. Post WebWentensionse: 0/5. Completely useless now. Serves absolutely no purpose whatsoever and does nothing at all. Downgrading to XUL based version, and switching to browser that still uses XUL. This was foreseeable and inevitable due to not merely to WebExtensions but Mozilla's complete and total failure to provide a competent API, using FUD to justify a neutered WebExtensions API and interface. To hell with Mozilla. Thanks to this developer for trying, but there's no point anymore.