Rated 4 out of 5 stars
Can't give it 5 stars because there is a glitch:
Switching from "Don't load images" to "Load cached images only" often (or always) does not work. It should load cached images immediately, and instead, to view the cached images, you are forced to switch to "Load all images", which completely defeats the purpose of cached image mode.
If I'm using this addon to save bandwidth by browsing in cached images mode 90% of the time, I don't want to have to switch to load all images.