Bug 971630 - Australis: Far right/left selected overflow tabs look bad on session restore. r=mconley

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extra : rebase_source : b0179a2890f7b59a6b855ee0d1433874f20b1698
Bug 993421 - Only set the position:relative on the PanelUI-footer-inner when a subview is showing. r=Gijs

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extra : rebase_source : 53bfa07881dd1279073d7dc1378a34fc2fbbb503