1. Immediately after installation, it is necessary in the Settings on the “Shortcuts” tab in the "Press to block site..." parameter change "G" to something much more complex, for example, "CTRL+SHIFT+G" (to avoid random blocking of sites).
2. On the same tab (“Shortcuts”) it is recommended to give Imagus Mod permission (checkmark) to download content - item “Save popup content”. The recommended hotkey for saving is "S".
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Search for updated versions of the sieves on "Imagus Reddit" (type into a search engine). There you should also ask your questions about problems with Imagus / Imagus Mod.

Doesn't work consistently have to remove and install this extension multiple times

Essential for regular browsing. Can't live without it, honestly.

I replaced it by "Image Max URL" and now I'm happy!

Abandonware. More and more websites this is now failing to work and it never gets fixed. I am fed up with this laziness.

Schon nen bisschen geil :D

It just constantly stops working. Installed it clean, didn't change any settings, imported the updated sieves. When reinstalling, it works for like 20 minutes and then just breaks again. Never had this problem with the original, so sadly going back there for now. Firefox 124.0.2 (64-Bit).
Edit: Tried it again. It also fails to fetch videos and image galleries directly from new.reddit.com - the original Imagus does this without any problems.
I really wish this was fixed, as some features, like the page dimming one, seem very nice to have.

The "wait before start another zoom" feature still doesn't work, just like the original Imagus, but now it adds this useless big description box that makes it impossible to start or stop a video on any page, especially if it's linked from Youtube.

Worked OK for a while and then just disappeared from my computer.