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You are talking about....?
You can use this https://www.tampermonkey.net/index.php?version=4.9.6091&ext=mfdh&updated=true
Yeah i know im 1 year late but
right now you can use the Tampermonkey Beta Extension
From Chrome WebStore: https://v.gd/TampermonkeyBeta
From Opera WebStore: https://v.gd/TampermonkeyBetaOpera