With ublock origin you can block loading of media above a certain size. You can pair that with addon called, "Image video block" https://github.com/tiborbarsi/

With ublock origin you can block loading of media above a certain size. You can pair that with addon called, "Image video block" https://github.com/tiborbarsi/image-video-block-browser-addon https://github.com/tiborbarsi/image-video-block-browser-addo... And finally, you can use Bandwidth hero to compress images on the fly. You need to host the server instance on Heroku. Their free tier should suffice