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My firefox extension loads content from a 3rd party site into an overlay panel. This content is user generated and sometimes will, for instance, have an image tag that does not close which causes a mismatched tag error to be thrown and the extension fails. Is there any way I can sandbox this content so that these kind of errors are not an issue? I was thinking maybe load the content into a blank iframed page.. but was wondering if there might be a cleaner solution.
Unfortunately, unless you’re getting back XML, there is no XPCOM solution for parsing. Your best bet is what you suggested – placing the content in an iframe.
You can find some more discussion about the topic at: http://www.mozdev.org/pipermail/greasemonkey/2005-April/001255.html