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The preference was true by default and never exposed to the users, so removing it is the logical next step. This patch removes all occurences of the preference, and add a fix to the RETURN key handling when the autocomplete popup is open (this is asserted on a test where autoMultiline was explicitely disabled.) MozReview-Commit-ID: 5783AK8lGR --HG-- extra : rebase_source : 349a808b86410f5470d19c4f32d2b7040e060fbb