Custom_Buttons
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[meta] Auto open menu (and close other) doesn't work in Firefox 36+
&& node.namespaceURI == xulns
&& node.boxObject
&& node.boxObject instanceof Components.interfaces.nsIMenuBoxObject // Always false now
Probably due to https://bugzilla.mozilla.org/show_bug.cgi?id=979835 - Port BoxObject to WebIDL.
Oh, downloads button have open
property (from chrome://global/content/bindings/button.xml#button-base), but that property only sets attribute (and don't open/close downloads panel).
Also check for node.boxObject
presence should be removed for Firefox 69+…