How to force FireFox to reload the page and ignore cache
You can use Ctrl + F5 for a single use basis, or if you want firefox to always reload the page then type this into the address bar:
about:config
type this into the filter:
browser.cache.check_doc_frequency
change the value to: 0 or 1
the default value of 3 is just silly
more info:
3 – only check if it seems outdated
2 – always use cached version
1 – always check for newer version
0 – check for newer version once per session