I expect this is due to the old version of the website being saved in Firefox's cache rather than being downloaded from the internet. You can refresh a web page without using cache (full page refresh) by clicking Ctrl + F5 on the keyboard. If that doesn't work the clear the cache using the instructions here: [[How to clear the Firefox cache]]. Also I notice that you are using Firefox v23. This is now an outdated version. To get the latest security fixes I recommend upgrading to v24. See here for more: [[Update Firefox to the latest version]]