xpconnect must enable shared memory for its global objects in a few cases, when shared memory is enabled by prefs. (These changes were left off bug 1231337 in part because of bug 1239666, and the problem was uncovered by a fix introduced for bug 1239605.)
Try run attached to bug 1239605.
Comment on attachment 8708918 [details] [diff] [review] bug1240453-opt-in-shared-memory.patch r=me
Attachment #8708918 - Flags: review?(bzbarsky) → review+
https://hg.mozilla.org/integration/mozilla-inbound/rev/ad02cf82f514564d66604300b5d3b43b4f3df9d2 Bug 1240453 - enable shared memory in xpconnect. r=bz
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