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Is there any way, to create a global function (i.e. MyFunction) in a browser, so, I can execute it on any site, on any page (because browser will know it).

Alexandre Neukirchen
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T.Todua
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    Of course. Create an extension. For example in this answer new function is added to `window`: http://stackoverflow.com/questions/9051205/adding-custom-functionality-into-chromes-console/9051533#9051533 – dfsq Dec 20 '16 at 13:05

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