I have been trying for a few months now to find the Flash-aid add-on for Firefox, but is is no longer available. As I am not the only one with this problem and I have, at last found version 2.2.3 xpi, which was the last version, I should like to post it here to make it available to all. To install, go to add-ons, click on the cogwheel and select "install manually". Done!!