I think it would be good to have that on both the client and the server.
Also, as simple as this might be, making it a de-facto standard (on meteor) would be a good thing since it would be a tool that we can count on, all the time. There are too many browsers IMO to make an extension a viable option.
Whitelisting variables would be good as well ; that way we do not get alerted if it is something we expect to be global.