On 9/20/13 11:14 AM, Patrick Brosset wrote:
The helper is here:
http://mxr.mozilla.org/mozilla-aurora/source/toolkit/devtools/LayoutHelpers.jsm#370
379 if (docShell.isBrowserOrApp) {
...
389 } else {
390 return win.frameElement;
391 }
So for anything on desktop it is in fact doing win.frameElement.
But .frameElement will return null if that would cross origins. See
http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#dom-frameelement
So if your "win" has a parent that is not same-origin, you will get null
here.
You should be using the docshell codepath in all cases...
-Boris
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