Why is my chrome extension not returning/scraping any emails?

So i wanted to create a simple email scraping(I’ve just started learning) chrome extension. However when i run it it doesnt return back any emails nor there shows any error can anyone help with what changes do i have to make. Here’s the link to my code (https://github.com/Mishannnnnn/web-scrap.git)

I don’t know if its the problem with the regex i did try a few.could someone please help me by reviewing my code.