hi! this feature specifically doesn't work yet with Firefox only. https://github.com/code-charity/youtube/issues/2310, however, since Firefox featured us, now all known Firefox bug can be considered urgent. Did you possibly forget using the feature to hide recommend videos? Please consider it is more likely that there was no need to reinstall. We are one of the biggest projects among the browser extensions already. Over 170 People have helped. Still it is common, that some issues stay for years. You can make a difference. 1000 of steps have been done and 100 are currently on the to-do Lists. We prioritize.