This may help you understand the difference of each browser:
For Chrome you can troubleshoot with google site here:
For Firefox you should check this page:
Thank you for your suggestions Hitomi, but I have tried all the obvious suggestions (removing and reinstalling Flash from each browser multiple times).
Frankly I don't believe Oswald was the only shooter in the Kennedy Assassination, so I must simple be open to conspiracy theories, but when Adobe Flash suddenly stops working in my 2 favorite browsers all in the same week, yet works swimmingly well in my least favorite browser I suppose I get suspicious.
For now IE9 is back to being my default browser as much as I am disappointed in that fact. But at least websites utilizing flash technology work in that browser.