I'm not really sure why hg.mozilla.org doesn't set Access-Control-Allow-Origin: * on at least things that provide json. https://hg.mozilla.org/try/json-pushes appears to allow it because that's how tbpl works. I'd like to see https://hg.mozilla.org/try/json-family also have it set so I can get information off of a specific push (that same url for all other repositories would likely be good too). I'm currently using it for this bit of code (https://gist.github.com/971090), but it would enable other useful things that I could think of as well. Can we please get this turned on?

bug 563074 fixed this for the pushlog, but I don't think we did this in general. I don't actually know how we'd fix this in general, since it's all hgweb, but it might be possible.