Flashplayer keeps crashing with Firefox.

I have Windows 10 and Flashplayer crashes when I open my browser...not every time, but 7 out of 10 and it is extremely annoying.  I have to close my browser and reopen it to continue.  I know there were problems with Windows 8, but I went from Windows 7 to 10.  I don't understand the reason for this continuing problem with Flashplayer and why no one can fix it!!!!