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Why does it only display when on steemit.com?

I wanted the toolbar to be as less invasive as possible. Moreover, as Google Chrome does not natively support additional toolbars, it might break other websites behavior.
I might consider later adding an option for it being always on

Thanks for the response. I would love it if it worked whilst I browsed round other sites. Thanks

Other sites are worthless!! Stay on Steemit! :P

But I can't pay my bills, do banking etc etc on Steemit!! I need to come up for air sometimes and when I do, it would be great to be able to check voting power and exchange rates at a glance!!

OK, you got a point.
It will be easier to add an "always show" option to the toolbar than to integrate bills payment and online banking into Steemit ;)
Stay tuned for next releases ...