Hello,
I'm currently investigating a bug we're having in the DevTools inspector
(https://bugzilla.mozilla.org/show_bug.cgi?id=917448) whereby the
inspector won't load for some websites.
One such website is http://jsbin.com/, and we've narrowed it down to a
problem we're having with inner iframes detection.
When the site loads, we listen to (using nsIWebProgressListener) state
changes and for each window that completes loading, we call a helper
function that'll tell us if that window is the website's top one or not.
The helper is here:
http://mxr.mozilla.org/mozilla-aurora/source/toolkit/devtools/LayoutHelpers.jsm#370
For each window that finishes loading, it uses its docShell to go up to
the parent and therefore check if that window is indeed a nested frame
or not (rather than using window.frameElement which would return null
for mozbrowsers and mozapps iframes).
So, for jsbin, it turns out one of the iframes being loaded is
considered as the top level window, even using its docShell.
If anyone has any idea why that is, that would help me a lot!
Thanks
Patrick
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