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Revert "Bug 1462415 - Delete onboarding system add-on r=Standard8,k88hudson" This reverts commit f7ffd78b. Revert "Bug 1498378 - Actually remove the old onboarding add-on's prefs r=Gijs" This reverts commit 057fe36f. Bug 28822: Convert onboarding to webextension Partially revert 1564367 (controlCenter in UITour.jsm)
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