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While we at Mozilla know you can do a lot of good things in JS these days - after all, we're even launching our own phone OS building fully on HTML+JS, and we have been using more and more JS code to power key functionality in our browsers and other products over the years - it's great to see that complex things like editing maps can be done fully in JS and available for all platforms now, while previously it took proprietary and availability-limited technologies like Flash or Java to do the same thing.
Great work, OpenStreetMap guys!
(And yes, as a contributor to OpenStreetMap and even OSMF member, I am biased, but free and open map data on the web fits Mozilla philosophy pretty well anyhow...)