There's a discoverability problem with this tool because I've never heard of Fakespot or Mozilla Review Checker until today.
> Mozilla integrated Fakespot's technology directly into Firefox as the "Mozilla Review Checker" feature, making it easier than ever for users to verify product reviews without installing separate extensions.
If it was integrated directly into Firefox, it's funny that I don't recall ever seeing it. I wonder if it gets disabled if you set your security and privacy settings too high, or if you use the Firefox ESR versions (Extended Support Release).