Bug 1102131 - Part 4: Log console warnings for deprecated let blocks. r=shu
Bug 1105404 - Remove deprecated for-each-in loops in about:sessionrestore. r=mak
Bug 1105406 - Remove deprecated for-each-in array comprehension in about:newtab. r=adw
Bug 1105408 - Remove deprecated for-each-in loop in about:sync-tabs. r=mak