This addon is fantastic. Compared to other "no image" addons, this one does actually block all images, also background images, which other addon still seem to allow.
On my old pc, on my new pc, this has always been working great.
Also it is small, it is very modest in resources and in it's demand of overall attention. Always the first addon i install, when i need to (re)install Mozillla Firefox, together with Adblocker Ultimate and Facebook Container.