Some more finding Window size with old profile is 1425 x700 which kicks in padding here https://github.com/mozilla/activity-stream/blob/master/content-src/components/Search/_Search.scss#L159 viewport size with new profile is 1425x722 which kicks in default padding here https://github.com/mozilla/activity-stream/blob/master/content-src/components/Search/_Search.scss#L9
Bug 1569784 Comment 2 Edit History
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Some more finding Window size with old profile is 1425 x700 which kicks in padding here https://github.com/mozilla/activity-stream/blob/master/content-src/components/Search/_Search.scss#L159 window size with new profile is 1425x722 which kicks in default padding here https://github.com/mozilla/activity-stream/blob/master/content-src/components/Search/_Search.scss#L9