You may experience a problems when loading website's flash components as Firefox refuses to load them. This is because your flash plugin is out of date and needs update.
In order to fix this problem you need to update Adobe Flash plugin. On Fedora linux this procedure is simple as running a single
# yum update flash-plugin
Running transaction (shutdown inhibited)
Updating : flash-plugin-22.214.171.1245-release.x86_64 1/2
Cleanup : flash-plugin-126.96.36.1998-release.x86_64 2/2
Verifying : flash-plugin-188.8.131.525-release.x86_64 1/2
Verifying : flash-plugin-184.108.40.2068-release.x86_64 2/2