I can somewhat see the logic in this. Though I've never understood why the "about" window is the location for updates in the first place (is it because the version number is typically there?).

But removing them means royally screwing bug-hunting. You can't ask them what channel they're on - what if they disabled automatic updates? What if their employer did? You can't ask them what version they are on in two steps (Firefox/Help => About), you'll have to send them... where? Some deep internal about:something page that looks like merely viewing it will destroy your computer, and requires you to type something abnormal? And just try getting people to type something correctly, or explain to them what an "address bar" is. Menus are known and relatively easy to traverse - they're just reading text.

Not only that, but it'll make looking for information about bugs harder too, because people will refer to channels more often, which rapidly becomes out-of-date information with no way to know which version it applied to.

You want to remove version numbers from the notifications about updates? Great! Big numbers aren't awesome for encouraging people to do things. But don't hide the version.