https://chrome.google.com/webstore/detail/return-youtube-dis...
https://addons.mozilla.org/en-US/firefox/addon/return-youtub...
4,000,000+ users on chrome with 14k reviews. Maybe you are mistaking the review count for the user count?
Even if it were just 0.0003% that's still the same sampling rate as the average Gallup poll using 1000 people to represent the USA's 300,000,000+ population.