Did you try reinstall the add on?

Sorry for that late reply, but yes I've actually uninstalled and reinstalled it 3 times. Can't understand what the problem is. Have any other solutions?

I pulled this information from the page of flash video downloader:

All bugs and ideas, please, post here: https://fvdmedia.userecho.com/list/21650-firefox-extensions/?category=4944

!!!Attention Android Users!!! Please, Read below: Due to Android Market Policy you can't download from YouTube. We nothing can do with that!

Are you trying downloading from youtube? Try downloading from other sites, please

No, I'm not downloading YouTube videos. It's simply each site that does have flash, or even mp4 at that, just doesn't download. I just don't get it. The only media I can download are pictures. Firefox was the only reliable, sure proof browser that I could get flash videos with, easily. Now i may have to just find another. I try to download flash videos and the download won't even process. Then i try to download videos as mp4 then the browser just crashes. Sent tons of crash reports. Yet, no solution. I have an Android phone. Galaxy s II. Please help i don't wanna lose what use to be the best browser..

You'll have to get support from the add-on provider. There are support links at https://addons.mozilla.org/android/addon/flash-video-downloader/