Bug 906227: Last tabs with switch-to-tab should not create new tabs. [r=margaret]

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extra : rebase_source : 929416c50248094fb3164b3b34a48486ac70f668
Bug 910882: Change search suggestions background to a lighter blue. [r=margaret]

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extra : rebase_source : cd4b8ab06669bc856bded04392d71abc6e8961ac