Create Google Chrome extensions,start after load !?

Hello folks

I have created a Chrome extension.
So far everything is fine.
The extension works like this, I am on the desired page. there I click on my extension at the top left and then on a button

Now my extension works as desired.

But now I want the extension to start as soon as the page is loaded? How and where do I do this exactly?

I am already grateful for any help
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