It's working!
If I may add a little remark though. I was wondering if there is a way to open images in a separate tab (without going through the source code with Chrome).
In this post for example there's a really big picture:
https://community.meraki.com/t5/Wireless-LAN/Meraki-and-Purple/td-p/34603/jump-to/first-unread-messa...
To be able to read everything, even with the lightbox working, you're have to download the image. If you were able to open the image in a new tab, the browser would allow to easily scroll around on the picture. Maybe that's what the maximize button is supposed to do, but then it doesn't work for me.