How do I make a chrome extension to add a break tag after every para tag in a webpage?

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Javascript

CSS

HTML

extension

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I want to make a chrome extension that will add a <br> tag after every </p> tag in a webpage automatically after loading.

I am not familiar with CSS to be able to code it and it is very confusing for me. I only know a little bit of Python so I can modify a bit but not make a code from scratch to do this.

What I have tried:

I have made a manifest file and a dictionary folder. But that is all I was able to do.