As I understand it to prevent a page from being cached when using the https protocol you need to include the following directives in the header <meta http-equiv="Cache-control" content="no-cache"> <meta http-equiv="Cache-control" content="no-store"> <meta http-equiv="Pragma" content="no-cache"> <meta http-equiv="Expires" content="0"> I did a test, creating two html files, one called uncached.html with these directives and another called cached.html without them. I called both of them using https protocol and both appeared when I view the cache by typing in the URL about:cache. I then exited Firefox, started it again and typed in about:cache and both urls were still there. By way of comparison I tried it under IE. cached.html was cached, uncached.html was not. In Chrome neither was cached. (when called using http instead of https both were cached.)