I wish more people would see this. They know exactly how to sandbox it, they’re telling you how to, they’re even providing and recommending a browser extension to securely restore the functionality they’re removing!

The security argument can be valid motivation for doing something, but is utterly illegitimate as a reason for removing. They want to remove it because they abandoned it many years ago, and it’s a maintenance burden. Not a security burden, they’ve shown exactly how to fix that as part of preparing to remove it!