Mozilla is definitely doing the right thing by reviewing the extensions, but the issue here is that were wrong, they found issues that didn't exist (such as claiming it contained obfuscated code and collected private data).
It appears the issues were found using simple heuristics (e.g they detected string pagead2.googlesyndication.com in a comment) and these detections weren't then manually reviewed as claimed, which is wasting everybody's time.
Why does lying about manual review seem so commonplace?
For example, during basically any YouTube copyright or moderation controversy, there is always "manual review" of videos that have obviously been caught in automated systems that in case of actual manual review, would be cleared of problems by any reasonable human.
It appears the issues were found using simple heuristics (e.g they detected string pagead2.googlesyndication.com in a comment) and these detections weren't then manually reviewed as claimed, which is wasting everybody's time.