Works perfect on my Android phone (Android 7.0), but not good on my Tablet with Android 5.1 because AMP sites are just empty. Where there should be the AMP-content, there is a empty place-holder.
I love it. I've always used chrome then switched to Firefox and was disappointed with Google searches. But didn't want to use mobile chrome and miss the integration from Firefox. This fixes everything for me.
Made Google web and image searches act like they do on Chrome. Fantastic. Haven't really tested it extensively though but you just assume it's gonna keep working?