java and firefox crashes on FC13

[Alex]

Hi,

>> This is definitely something that happened with a recent update.
>> Firefox was working fine since I installed FC13 (just slow, as
>> always), but it never crashed. Now I'm afraid to even use it.
>
> After a crash, there should be something in ~/.xsession-errors.. can you
> post its contents?

Wow, there's a boatload of information in that file on a thousand
different errors with lots of helpful information. Should have known
about this file a long time ago. Here are some recent lines:

*** NSPlugin Wrapper ***
WARNING:(../src/npw-wrapper.c:2537):invoke_NPP_HandleEvent: assertion
failed: (rpc_method_invoke_possible(plugin->connection))

*** NSPlugin Viewer  *** WARNING: unhandled variable 18 (<unknown
variable>) in NPN_GetValue()

(npviewer.bin:8869): Gdk-WARNING **: XID collision, trouble ahead

(acroread:29296): Gtk-WARNING **: Unable to locate theme engine in
module_path: "clearlooks",

Gtk-Message: Failed to load module "pk-gtk-module":
libpk-gtk-module.so: cannot open shared object file: No such file or
directory

Gtk-Message: Failed to load module "canberra-gtk-module":
libcanberra-gtk-module.so: cannot open shared object file: No such
file or directory

No accelerated IMDCT transform found

The first message seems to happen every time I change focus from or to Firefox.

Not sure how many are relevant other than the first, but how can I go
about fixing the others?

Thanks,
Alex