Why is the image not displayed in the Chrome App/Extension from an external server?

Question

Browser extensions

Good afternoon) I am writing a Chrome extension that works in a separate window "outside the browser".
Faced such problem:
I cannot open any image of a type <img src="http://mysite.ru/1.jpg"/>
In the manifesto in permissions mysite.ru it is registered.
Yes, and I send/receive GET requests via XMLHttpRequest to it perfectly.
But I can’t open a simple picture from the link, why?