Anyway, it's not that big a deal and it takes all of five minutes to fix. Herewith are the instructions for installing Flash support for Mozilla.
Personally, I prefer to download the installer manually from the Adobe web site. It comes as a 2.5MB archive file in tar.gz format.
Open up a command-line terminal and unpack it. Note that, by default, Mozilla places all downloaded files in the Desktop.
tar xzvf install_flash_player_9_linux.tar.gz
Go into the resulting
install_flash_player_9_linuxdirectory and run the installer.
Follow the dialog. Most defaults should be sufficient. Of course, you'll need to restart your browser to activate the Flash component. You should then be good to go!