(gdb) bt
#0  0x00110416 in __kernel_vsyscall ()
#1  0x00a6f1d3 in __waitpid_nocancel () from /lib/libc.so.6
#2  0x08049944 in check_plugin_viewer (plugin_file=0xbf8fdc09
"/usr/lib/mozilla/plugins/librhythmbox-itms-detection-plugin.so",
p_arch=0xbf903036 "i386") at plugin-config.c:338
#3  0x08049a66 in check_plugin (p_plugin=0xbf8fa90c, out_plugin_info=0xbf902012)
at plugin-config.c:367
#4  0x08049aae in wrap_plugin (p_plugin=0xbf8fa90c, plugin_info=0xbf902012) at
plugin-config.c:481
#5  0x0804a677 in install_plugin (p_plugin=0xbf8fa90c, plugin_info=0xbf902012)
at plugin-config.c:503
#6  0x08049fed in process_plugin_dir (s_bits=32, t_bits=32,
p_plugin_dir=0x8052be0 "/usr/lib/mozilla/plugins",
p_plugin_dir_wrapped=0x8053cdf "/usr/lib/mozilla/plugins-wrapped", 
    scanned_dir=PLUGIN_DIR, process=0x804a720 <check_installed_plugin>) at
plugin-config.c:734
#7  0x0804a156 in process (process=0x804a720 <check_installed_plugin>,
scanned_dir=PLUGIN_DIR) at plugin-config.c:751
#8  0x0804a46e in main (argc=2, argv=0xbf9031d4) at plugin-config.c:972

Version:
nspluginwrapper-0.9.91.5-27.fc9.i386