What's the difference between removing and disabling? Aren't they effectively the same? The source is still there to read/hack. Do you care about a few lines of inactive code? If so, I'd start the purge with Hello.
I can't speak for firefox users, but when I buy a phone and it comes with a "phone company daily deals" app that that can't be removed because it's a "system component" it often seems to me that they could easily have been made it removable, and that making bloat impossible to remove was a business decision.
Perhaps firefox users feel the same way.