<p>I think it's useful to open a new tab for that to make it clear to the user, that he/she is reporting the problem to openstreetmap.org and not to the website where the map is embedded.</p>

<p>Additionally these embedded maps are sometimes quite small, and it wouldn't be very pleasant to browse <a href="http://openstreetmap.org/fixthemap">http://openstreetmap.org/fixthemap</a> and the following sign up process in a small iframe embedded inside another page.</p>

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