Rated 1 out of 5 stars

I noticed unexpected network activity which I traced to Thunderbird which was especially suspect when I found Thunderbird would not close properly as the process was preventing that (I had to force close) then when disabling addons to trace I find Noia Fox options will not allow itself to be disabled! So I removed it, now no suspect activity & Thunderbird closes cleanly.

I know the conclusion is not definitive, but currently I do not trust this add-on.