It's a good extension. I would give it 5 stars, if I wouldn't have this displease: after restarting Firefox my "Deactivate LocalCDN for these domains" list gets reset. I would like a fix for this (or an option to disable the resetting behavior) -- I assume this is a bug, since it happens on my personal and my work PCs in Ff, but not in Chrome-based browsers.
Thanks for your feedback. Yes, it's normal with Google services (not only Maps), because in the default settings Google Fonts are blocked. For a privacy focused addon, this is the only practical default option.