Part of Mozilla's bad decisions with Firefox generally boiled down to "we don't have someone to maintain this", or "our analytics show people don't use this".

Shit gets removed, people get upset, and they're told to deal with it. They didn't consider that the people who used the features that were removed also didn't send telemetry data, so they made a dumb decision based on incomplete and inaccurate data instead of something sane like appeal to the community and invite people to maintain or test it.