the flash crashes are a confirmed Adobe bug.
the problem is caused by too many sandboxing methods stacked, Flash
introduced "protected mode" in its plugin which causes no end to trouble
for Gecko browsers that are already using OOPP.
Adobe itself recommends disabling Protected Mode until a fix comes out that is resolving the issue.
To disable Protected Mode you need to edit the mms.cfg file located in one of the two directories:
Windows 32bit: C:\windows\system32\macromed\flash
Windows 64bit: C:\windows\syswow64\macromed\flash
Just open the file with a text editor (you may have to run it as Administrator) and add the following line to the mms.cfg file:
ProtectedMode = 0