After installing “Swiftfox”, an optimized version of Firefox 1.5, I discovered I still experienced crashes with the flash plugin. Clearly something else was wrong. So I ran firefox with strace on the CLI, and discovered the problem may be related to Xorg. Then I did some searching on the web and eventually discovered that Xorg on Edgy Eft has the composite extension enabled by default. Now I ask you, is that really a wise decision? Clearly not.
Anywho, if your system suffers from the same symptoms, just open xorg.conf in an editor like this:
~$ sudo gedit /etc/X11/xorg.conf
Then append the following lines of code:
Option "Composite" "0"
The restart Xorg, try pressing CTRL-ALT-BKSP, or reboot, or dance a jig. Whatever works for you ;)
If all goes well, the Flash plugin should know work normally. Well, it does for me anyway.