Created attachment 8810787 [details] bughunter stack found via bughunter on a NSFW Website (ask me for the url) and reproduced on latest m-c tinderbox windows opt and debug build. affects trunk to debug builds from beta to trunk with crash on load of this page https://crash-stats.mozilla.com/report/index/28cbf979-5f86-461a-8a11-f3aad2161115 is the opt crash and a (i guess) more useful stack from bughunter attached.
Looks like some infinite recursion happens between HandlePostedReflowCallbacks and FlushPendingNotifications.
We have seen such infinite recursion before, e.g. bug 866767.
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