Flash crashes constantly, regardless of whether or not I use Firefox, Chrome, or Chromium.
It does not always crash, but I would estimate it crashes 4 out of 5 times when loading a page. It seems to be most likely to happen on pages that have more than one Flash item. It also happens when Flash has to make a transition of some sort. For example, when Youtube switches from an advertisement to the main video, then it might crash. Also, some sites are more likely to crash than others. Vimeo will crash with almost 100% reliability. Youtube is fairly stable, and crashes maybe one out of five times.
I have tried uninstalling and reinstalling Flash. I have tried the Flash-Aid plugin, but none of the options it presented helped (in fact, it always ended up simply removing Flash and not finding an installation candidate).
I think it might have something to do with how Flash is connecting to Pulse. Part of the reason I suspect sound is a problem is that I had to get help to get Flash to work with my sound before.
As far as I understand it, all that's different about my sound system is that I go over a network to connect to a Pulse sound server on a different machine, and that I've hardcoded the server IP and port by adding a line that says
PULSE_SERVER=192.168.0.4:4713 in the file
/etc/environment on the client machine. That's basically it, I think, but for more specifics, there are details here.
Unfortunately, it seems that Flash doesn't like this set up. It's maddening to have Flash be so unstable, so I hope someone can advise on how I might diagnose and solve this problem.