I have used Fakespot for years and have been pleased with it. I don't have a problem with the permissions granted since I use Firefox and they block Facebook and that is all that I am concerned about. So far I have trusted Fakespot and they have been spot-on. I also have Malwarebytes on my computer and if there was a problem with Fakespot they would alert me. When I have been warned about new sellers I have respected that and then I wait until they have proven themselves to be legitimate.
So, that's why they have earned 5 stars from me. I would give 10 if they were available.