How to Solve Adobe flash player plugin crashed in Mozilla Firefox

I am running windows 7 on my laptop, using Firefox version 38.0.5 with Flash Player 18.0.0.194. The issue is a lot of the times when I try to play flash file on http://www.quotiva.co.uk/  the flash player crashes and reloading the page doesn't always work to fix the issue. This issue has happened on at least 3 to 4 different sites, when it crashes the only option it gives me is to reload the window and like I have already said that doesn't always work. If there is anything I can do to fix this please let me know and if more information is needed, please let me know and I will send it. Thank You