title: Why does firefox not appear to be caching images?
body: <p>EDIT: Answer provided below.</p>
  
  <p>I've struggled for a couple of days to understand why Mozilla Firefox continually failed to retrieve images from its' cache as opposed to fetching new copies everytime I reloaded a page.</p>
  
  <p>Google Chrome didn't appear to have this issue, but that's because refreshing the page in Chrome does NOT force it to reload images (unless a CTRL-F5 is used).</p>
  
  <p>Below I've answered my own question and added some extra info that I hope will save someone else some time in getting their head around this issue.</p>