Purple background for private tabs tray [Firefox for Android]

[Synchro]

Now: A tabs tray has white background for both regular and private tabs. At the same time all other elements (new private tab's homescreen, search bar, menu) in private browsing are purple.

I suggest: To change a private tabs tray's colour also to purple so that it would be easier to say whether these tabs are regular or private.

Firefox Mobile 

[Jon]

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