Despite me having set the minimum size and check off to use the setting it drops to 30 bytes on random sites. Basically, it does not honor the low limit in like 30-40% cases. And no, I do not have "disable on new tab" set. Imagine when you cannot reload a page but need images to load, like during a quiz!
Also, the Control/Shift-click+mouseover to load feature has never worked for me, not even once, for many years and versions of browsers and this addon. Not sure why the dev advertises it when it does not work. Should make something more robust like right-click menu or hotkey.
I am very happy that overall this reduces my network traffic like 50% but the above shortcomings are annoying.

Update after 2 years: The shift-mouse over image loading finally began to work, but the 30-byte minimum still occurs on great number of random sites. The developer clearly does not make any effort to address this. The limit per site is also a very important missing feature. Is it too hard to save the setting in a SQLite DB? Huh?