I confirmed in [a profile](https://perfht.ml/2JCTjCa) that `RFindLineContaining` has gone away with the latest patches; the profile is now a good bit flatter.
Bug 1300293 Comment 15 Edit History
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I confirmed in a profile that `RFindLineContaining` has gone away with the latest patches; the profile is now a good bit flatter. (Edit to remove incorrect profile link; I lost the real one.)