Mozilla has announced that all current versions of Firefox will block Flash by default due to security concerns.
http://www.bbc.com/news/technology-33520935
Of course, these security concerns have been known for quite some time, and are responsible for why I haven’t allowed Flash to install on any of my computers for the last 3 years. Still, it’s good to see Mozilla flex it’s muscle to get something done about them.
Vernon Pope 
Well, that explains why I have difficulty accessing some content on some websites.
If you want to, you can go to Adobe’s website and install Flash Player yourself, but just understand that (for now) doing so will make your browser and computer less secure.