22:40:43 <bdahl> dholbert: over in bug 1466897, i added the assert during nsCanvasFrame::DestroyFrom and it fails. It looks we don't null out the frame earlier because the link from the viewportframe and the canvasframe is already gone which causes us to not be able to find the root box in
22:40:43 <bdahl> https://dxr.mozilla.org/mozilla-central/rev/199a085199815cc99daa658956a7c9436e1d436b/layout/xul/nsPopupSetFrame.cpp#111
22:40:45 <firebot> https://bugzil.la/1466897 — NEW, bdahl⊙mc — Support context menus from top-level HTML pages
22:41:34 <bdahl> dholbert: interestingly this also happens with the XUL code
22:46:23 <dholbert> bdahl: that is concerning
23:56:18 <dholbert> bdahl: I think I was wrong about the asserted condition -- I'll add a note on the bug