Contentscript not running on AJAX intense pages?

I'm developing a Chrome extension and I've noticed that my extensions contentscript doesn't appear to run if the page I'm dealing with has a large amount of AJAX on it. For example Gmail /开发者_如何转开发 Google Doc's... Why is this? Does anyone know of a work around?

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Gmail and Docs has iframes all over the place.

Make sure you place "all_frames": truein the Content Script Manifest