Website pictures are not included on the protected websites

It seems like pictures are processed as a part of webpage for wikipedia, but they are not included when you try to grab password protected New Scientist article to read on the Kindle.
I can see that images are pointed to
`src="../images/img-2834563815.jpeg"`

but for some reason the images are not downloaded, even I probably have auth session present on the page, when the extensions is running.

Is there anything else I can do helping to fix or debug this issue?

Thanks for making such a useful extension!