Right, I forgot why I remembered you needed CacheViewer.
With BetterCache you can easily change the browser.cache.check_document_frequency setting which normally has to be done in about:config. This alone makes it worth having. I used it together with the CacheViewer add-on which shows mime-types that you can then use in BetterCache. This add-on is tremendously useful on sites like Google Books if you have dial-up. It only saves two or three pages at a time so if you’re reading along and want to go back a few pages you have to wait for the whole damn thing to load again. Just set BetterCache to save the mime-types you want and set “Check pages for actuality” to Never and you’re golden. :-)
OK, thanks guys. Seems like a lot of work, though. I was hoping to just install one or two things and be done. This seems more manual and laborious than I was expecting. :O)