I think maybe I could make this go away by selecting "every time" instead of "when the page is out of date" in Mozilla's cache prefs, but I think that will also make Mozilla go to the network when I hit the Back button, which would suck. I want it to send an If-Modified-Since every time I actually click a link, but use the cached copy for the back button. I think that's how it always used to work. Has something changed?
Is it Mozilla being stupid, or LJ?