I agree with Infrequent_User's review for how the developer should address privacy concerns in regards to Mozilla changing the way addon's permissions are explained.

I am reposting Infrequent_User's words below:

" I don't see how a "user ID" is personally identifying data as many people go by an online username, not their real name, and so "personally identifying" in the context of personal data feels rather vague. I initially gave a one star after the update but I urge the developer to write an explanation in the "about" section outlining what about Mozilla's policy they're working under. I feel like suddenly seeing a "hey, this extension needs your personal data now" notification would lead to a justifiable outcry from users, especially with no further explanation. Users can look at the website for the API but most people won't do that, and it's up to the developer to be as clear and open as possible. I do not blame the users for immediately growing weary and angry, especially when I had to look through other negative comments just to find a dev response. "