After reviewing the phabricator patch, you'll need to request beta uplift from the attachment details page: https://bugzilla.mozilla.org/attachment.cgi?id=9080188&action=edit
Bug 1557304 Comment 7 Edit History
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After reviewing the phabricator patch, you'll need to request beta uplift (set approval-mozilla-beta to "?" in the drop down on the left and fill out the form on the right) from the attachment details page: https://bugzilla.mozilla.org/attachment.cgi?id=9080188&action=edit