What a relief - why does every page get filled up with - mostly - irrelevant pics of .. kittens or ppl or phones or blurry stuff that someone though looked cool - 'ish -
Now all I need is to set up a function key to turn it on/off

Хорошее, полезное расширение. В наше время такие будут востребованными: в Интернете столько информационного мусора, что можно умом повредиться, если смотреть на него. Спасибо программисту.

work well, simple and fast.
on my motoX FF66 and win7 FF66
oh, just one thing, it shows"images are allowed" even when it blocks image on phone FF66

Works very good with Firefox Quantum. Extremely useful if you are on limited data and want to eliminate unnecessary images from consuming your data. It will load the images when disabled and page refreshed but will keep the same setting for subsequent tabs. Would be more useful if remembered the tab setting and even more if loads selected images.
All in all thanks for the effort of Christian Kuhl.

Works well. There's an option to auto-refresh the page when you switch on or off.