Segmentation fault when I use KDE4, Firefox and the flashplugin

[volkerbradley]

Here is what happens when I use firefox3b5 and the flash plugin. When I go to any site with flash movies, firefox disappears immediately. Here is what I see when I call firefox from the terminal:
firefox
GCJ PLUGIN: thread 0x805cb30: NP_GetMIMEDescription
GCJ PLUGIN: thread 0x805cb30: NP_GetMIMEDescription return
GCJ PLUGIN: thread 0x805cb30: NP_GetValue
GCJ PLUGIN: thread 0x805cb30: NP_GetValue: returning plugin name.
GCJ PLUGIN: thread 0x805cb30: NP_GetValue return
GCJ PLUGIN: thread 0x805cb30: NP_GetValue
GCJ PLUGIN: thread 0x805cb30: NP_GetValue: returning plugin description.
GCJ PLUGIN: thread 0x805cb30: NP_GetValue return
Segmentation fault
When I remove the plugin and go to any site that has a flash movie, Firefox does not crash.
Can you suggest a way to debug this?