This is a new warning on the console since bug 1004396 landed. Either "media.video.test_latency" should be a preference defined in all.js, or the call shouldn't be wrapped in an NS_WARN_IF statement. http://hg.mozilla.org/mozilla-central/rev/4947f68a3c0d#l1.32
Low priority but trivial to fix
backlog: --- → webRTC+
Priority: -- → P5
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