Sometimes I open a page with way too many images displayed sequentially (think of a really long blog post with dozens of big images); web pages built like that have some negative impact for the visitor, like consuming a lot of bandwith (specially for images with big filesizes), and for specially lower spec machines slowing down the browser, specially in case of a page with lots of animated GIFs.
Web devs can use a technique called "lazy loading" to deferring the request of images from the server until the very moment the browser tries to render them (or something like that). But it is implemented by the creator of the site, on its source code, out of control of the user.
I was wondering if there's a way to enforce lazy-loading on all the sites I visit (or a subset of them). Maybe a browser plugin / addon? Maybe an userscript? I want to enforce lazy loading for any site I visit, if that's even possible.
I have already searched the Mozilla Add-ons site with no success. I have searched Google as well, but everything I can find is aimed at web devs.
I'd strongly prefer a Firefox add-on that works on any OS, but I'm open to suggestions.