Some proposed probes: - Measure how frequently the throttling/killing mechanism from bug 1137871 is used. - Log occurrences of uncaught exceptions. These can easily be caused by invalid content, but the frequency would be interesting. Ideally, we'd even get stack traces containing only the internal stack frames. - Measure average/peak deviation from the SWF's set frame rate. - Measure average/peak render time/frame. - Log usage of non-implemented features.