This plugin looks like the missing link! Thank you! But what files and lines do I have to edit to get support for the “Large Square” thumbnail? Or is there no development going on anymore?

https://www.ads-software.com/extend/plugins/flickr-thumbnails-photostream/

I was just wondering if this plugin has Lightbox support, i dont mind that it send you to your flicker account but I would love to have a Lightbox support. Any ideas?

https://www.ads-software.com/extend/plugins/flickr-thumbnails-photostream/