Make Firefox's Window Colours Change More Visibly when Activating or Deactivating the Window

[Tomonop]

When switching windows with Alt+Esc, it can be difficult to tell if the Firefox window is active or not from it's title bar colours. It is especially hard to tell when the taskbar is not visible.

Please make the title bar colours change more visibly when the window is activated or deactivated.

I feel this may be especially important for keyboard-only users.

[Jon]

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