The new "feature" of the Project-GC browser extension that shows possibly invalid Challenge Found It logs bears discussion. It shows users with a Found It on a challenge that might not meet the requirements of the challenge.
I was looking at the Well Rounded Cacher Original Fizzy Challenge
https://www.geocaching.com/geocache/GC11E8N_well-rounded-cacher-the-fizzy-challenge
and saw a number of cachers listed as not qualified. I investigated a few of them and in two cases, the user did qualify and then the CO changed the D or T value later causing their qualification to become invalid. I found one legitimate non-qualified user but did not look through all of them. For some of them there is not enough information to tell what their qualifying caches were.
This feature seems to be a quick way for a CO to detect invalid qualifications which is convenient. I think there should be some sort of limit on the lookback of maybe 1-2 months because valid qualifications can erode over time. The CO can always check older ones than that manually. Perhaps, the list should only be shown to the CO rather than the entire community.