What "marketing bros?"

It's open source software. You can see what it does, and you just put it on your server. We're talking about pre NPM technology here, everything is vendored and local and no one is going to change that file without your knowledge and permission. And if someone does, you have much bigger problems on your hands.

What you can't own and control is the browser vendors and how they choose to implement things, or not to. You can edit a JS file to your specific needs, but you're stuck with whatever the browser decides.