Default browser settings are optimal for daily use. However, power users like software developers have to adjust few settings to achieve superb results. To adjust those settings type about:config in location bar.
browser.cache.check_doc_frequency = 1 browser.cache.disk.enable = false browser.cache.memory.enable = false
Line 1: browser.cache.check_doc_frequency set to 1, sets browser to checks for a new version of a resource (i.e. page/image/js/css) every time a page is loaded.
Lines 2-3 disables cache completely.