3/24/2012 10:27:45 PM
RE:Problem with Flash not showing in Firefox
There were also some changes in the source files and if you do not have the source code license, you won't be able to fix it.
Would it be possible for you to take a backup of your site, try the hotfix on it - if there are any issues, let us know, we will help you to fix them and then apply the hotfix to the current project so you will know what and how to do in case of any issues?
Or, upgrade to v6 is also a solution.