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Image blockers don't work.
Can't find an image blocker that works with Quantum Firefox 57.0.2.
Wšykne wótegrona (1)
Copy/Paste image blocker into https://addons.mozilla.org/en-US/firefox/extensions/ There is a couple there. Am sure there will be more in time as people finish coding for the requirements for security. Give it time where there is a need someone will step in.
If configure Ublock to block the image servers then that works but is a pain to do for each site then reverse when want to look.
Please let us know if this solved your issue or if need further assistance.