Bug 907559 - Update the PGO profile to open and close tabs between test pages. r=ted

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extra : rebase_source : 525887cb80092f795f0026aaf0fee8b4f559ea55
Bug 894048 - RemoveAllTabsBut should use {animate: true} when closing tabs. r=ttaubert

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extra : rebase_source : 35d7438eb53d6cdf9a40be6f5ec1a880748b81a2