Firefox 1.0.2 crashes with Flash Plugin

Summary: Flash plugin cause Firefox to crash.
OS: Hoary (with latest updates)

Firefox started crashing a few days agos, at first it appeared to be when 4 or
more tabs were open. After removing all themes, extensions, & plugins Firefox
stopped crashing. (See bug #14911 where I appended some comments
https://bugzilla.ubuntu.com/show_bug.cgi?id=8589).

I reinstalled the plugins one-by-one and it appears that when the MacroMedia
Flash plugin is installed Firefox crashes on pages with Flash content. I've
trying using the libflash-mozplugin but it causes the browser to freeze up.

This is not a critical bug, but it does affect the ability to web-browse as many
sites use Flash. And means I either have to surf Flash sites using alternative
browsers or OS's. :(

Let me know what more I can do to provide information about this issue.