How to make additional functionality through chrome extension on ajax page?

Question

Google Chrome

Hi all!
I have an extension for chrome, I want to make an additional button appear on each photo, how can this be done?
When the Instagram page opens, it is empty, and only then the data is loaded, here's how to change the incoming data so that there is also a button. Or is there another way?

Answer 1

habrahabr.ru/post/202366

Answer 2

By and large, there is only one solution - at a certain interval (every second, for example) check for new photos on the page and render your button in them.