Facebook + hosted.html

A Facebook app I've been working on has stopped working in hosted mode. Some editing of hosted.html was always necessary to get it running inside the Facebook canvas, as per: http://code.google.com/p/google-web-toolkit/issues/detail?id=4468

I've updated Eclipse (4.2.1), GWT (201212122042), the Eclipse plugin, Firefox (17.0.1) and the Firefox plugin (1.0.11394).

The page is served, nocache is loaded, hosted.html is loaded, two .css files are loaded and then there's a GET to http://gwt.google.com/missing-plugin

The application works fine if loaded directly. From suggestions in earlier threads, I've tried using 127.0.0.1, localhost and a fake domain set in my hosts. It looks like Firefox isn't letting the Facebook canvas iframe access the plugin. I disabled all my other plugins but that didn't help.

Any ideas for the sudden change/how to fix it?

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