Why DOES Adobe Flash Player keeps crashing

This is a user-to-user forum.  Adobe does not provide direct technical support for products it offers free of charge.  The staff that answer questions here do so as a courtesy, frequently in our free time and evenings.  Expecting a response within 3 minutes, at 1AM local time is probably not the most realistic expectation.  Using Google to search for the problem, or reading the FAQs is probably a better resource for an immediate answer.

That said, I'd start by disabling hardware acceleration.  If it's an issue with your hardware or drivers, the problem should go away. 

There's a comprehensive guide here:

https://helpx.adobe.com/flash-player/kb/video-playback-issues.html

If that doesn't work, a relevant crash report from Firefox would be helpful.

In Firefox, go to about:crashes

Choose a crash with a timestamp that corresponds to a Flash crash.

Click it to submit, and paste the link from the resulting page in a reply. 

I'll be happy to look at it on Monday when I'm back in the office.

If hardware acceleration didn't solve the crashing, it would also be interesting to know whether or not the other plugins you're running are in play.

If you go to Firefox > Help > Restart with Add-Ons Disabled, do you still see high frequency crashes?

If not, you might want to disable all the add-ons and re-enable them individually until the crashes come back.  If you isloate it to a specific plug-in or add-on, we'd be happy to take a look.