This is fallout from bug 1359833. There is an assertion before the timeout: > Assertion failure: mListener, at z:/build/build/src/image/imgRequestProxy.cpp:293
I see what the problem is. The assert is wrong in this context, so thankfully release builds are fine.
Assignee: nobody → aosmond
Status: NEW → ASSIGNED
Priority: -- → P3
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/760368896800 Fix assert in imgRequestProxy::Dispatch to accept a listener or a tab group. r=me
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