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# ->injectToolbar()
 -  adds styles
 -  adds javascript
 -  adds the toolbar
 -  does not add styles if there is no head
 -  does not add javascripts if there is no body
 -  adds the toolbar if there is no body
 -  adds styles once
 -  adds javascripts once
 -  adds styles once
 -  leaves inner pages untouched
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