Problem about the flash installing

Lately when I open my facebook, I got some problems with my flash media player. Even I install it, still it doesn't work. So I research and research the net to find whats the answer. I have the instructions in the adobe flash player how to install the flash. I did the things in there but it only worked on the internet explorer not on mozilla firefox. I tried and tried to install it in mozilla firefox but its no used. I was really devastated, but I kept on trying. But it was no used. So I just focused on the add-on' s in the mozilla firefox. Luckily, I did that because there I found the ADOBE DLM add-on. And right there I get to install my flash media player. I just missed that out. It run successfully.