No bug - Re-enable some media mochitests that no longer fail and disable a couple that fail frequently.
Bug 1019315 - Disable test_viewsource_forbidden_in_iframe.xul on all platforms for frequent intermittent failures.
Bug 953208 - Disable test_tcpserversocket.js on OSX for frequent failures.
Bug 891840 - Disable test_pixel_lengths.html on all platforms for intermittent crashes.
CLOSED TREE