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Kirk Steuber authored
Also creates the runOncePerModification helper function in Policies.jsm and fixes a minor bug in the runOnce helper function also in Policies.jsm MozReview-Commit-ID: HDgMmhHI1D0 --HG-- extra : rebase_source : 14c80ca332e8e4bf74f6d79ad0d6c7d8c54caf31
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