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Some of the changes in bug 1626083 result in a more deterministic flow that uncovers a race and an incorrect underlying assumption in the test. The underlying assumption is that clearing mode on shutdown is disabled in tests, which is false - it's enabled. The race is that we assume that the mode is already 0 and try to ensure it doesn't change, whereas it actually starts empty (undefined) and changes to 0, because of the incorrect underlying assumption. This mistake only exists in browser_cleanFlow.js, the other tests are correctly waiting for the final TRR mode without trying to ensure no change. Differential Revision: https://phabricator.services.mozilla.com/D114592
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