Android版Firefoxで毎日使用していますが、ちゃんと画像に関する通信をブロックしていて、データ使用量を削減できています。また、Firefoxをタスクキルしてもオン/オフの状態が保存されており、使い勝手が良いです。

Perfect. You have to tap the extention to turn it off/on, not in settings. It would be nicer if it turns off itself when we are using a search engine. But open source. Yeeehh.

Tried just about every image blocker extension there is, this is the only one that worked! Thank you!

Works great and somehow blocks the preview images to videos...so in dark mode blends in with thumbnails still clickable. Other two image blocker extensions show annoying white or gray thumbnails for videos.