Chrome: Ninety-nine times out of a hundred, your browser's cache is a handy feature. When it fails, though, it can be seriously annoying. Cache Killer prevents Chrome from loading sites from the cache.
When trying to figure out what's wrong with a particular website, often times the solution is to clear the cache. The trouble is that this wipes out everything for all the sites you use unnecessarily. Cache Killer simply forces sites to load directly, and it can be enabled or disabled at the push of a button.
Cache Killer | Chrome Web Store via Ghacks