I see that Mozilla is now using the same brain-dead customer feedback method that Microsoft used to remove major features because they were supposedly not used. Microsoft said that no one really used the Windows Start Menu so they just took it out completely in Windows 8. Well we see how well that worked for them. Millions of people were loading Classic Shell and other add-ons to get their Start Menu back. It was a total disaster! They probably lost billions in sales before they realized their stupidity and restored it in Windows 10.
This automated feedback method to determine which features are used has been shown to be worthless. And to hand it down in this dictatorial manner without getting any feedback beforehand just shows how out-of-touch Mozilla has become (they have probably been more concerned about the voting record of their upper management to see if they pass ideological purity). I only use Firefox for the YouTube downloader and I use SeaMonkey for my everyday browsing. So it won't affect me unless this stupidity extends to the SeaMonkey team as well. But the power-users who are usually completely ignored because they've opted out of customer feedback will be screwed. The SeaMonkey team has been good at not dropping UI features (in fact that is the primary purpose in life of the product - to maintain a consistent interface since Netscape Navigator), unlike the Firefox team who have been just trying to emulate the most popular browser of the day which is now the horrible Chrome interface.