Doesn't work on firefox, throws error "ReferenceError: IntersectionObserver is not defined". Doesn't work with dom-repeat on chrome.

[rraagghhu]

[valpackett]

Yes, Firefox doesn't implement IntersectionObserver. There's a polyfill but… it's not very useful. Using the web components polyfill, the lazyload-image element gets loaded too late to prevent initial loading of the images.