The dev is trying to gaslight people in the replies to low star reviews saying that nothing about the extension has change and the reason it is asking for more permissions is just because Mozilla changed how they label the permissions but that's a flat out lie.
As many others have pointed out the add-on is now gathering unique identifiable user data, there is no way to prove that he is selling user data but it is the most likely explanation.
The other way the developer keeps trying to gaslight people is by claiming "Clearly nothing changed since we are a recommended add-on" knowing full well that the Recommended badge DOES NOT get reviewed with every new update. I have reported the new practices from this dev to Mozilla and I encourage everybody else do to the same.