OK I've installed firefox 3.5 and the debuging symbols. I'm still getting output telling me there are no debugging symbols though! I can reproduce the issue with firefox 3.5 as well. There probably isn't much of use in the output below, but I note the word RENDER appears near the end.. I wonder if this is might be an nvidia driver issue? I'm running the latest proprietary nvidia drivers. bob@hoss:~$ firefox-3.5 --debug /usr/bin/gdb /usr/lib/firefox-3.5b4pre/firefox-3.5 -x /tmp/mozargs.LTerZn GNU gdb 6.8-debian Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu"... (no debugging symbols found) (gdb) run Starting program: /usr/lib/firefox-3.5b4pre/firefox-3.5 (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [Thread debugging using libthread_db enabled] (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [New Thread 0x7f4bbb831700 (LWP 5813)] (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) ---Type to continue, or q to quit--- (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) ---Type to continue, or q to quit--- (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) ---Type to continue, or q to quit--- (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [New Thread 0x7f4ba7af1950 (LWP 5818)] [New Thread 0x7f4ba70e6950 (LWP 5819)] [New Thread 0x7f4ba62ff950 (LWP 5820)] [New Thread 0x7f4ba57ff950 (LWP 5821)] [Thread 0x7f4ba57ff950 (LWP 5821) exited] [New Thread 0x7f4ba57ff950 (LWP 5822)] [New Thread 0x7f4ba3dff950 (LWP 5823)] [New Thread 0x7f4ba32ff950 (LWP 5824)] [New Thread 0x7f4ba23ff950 (LWP 5825)] [Thread 0x7f4ba23ff950 (LWP 5825) exited] [New Thread 0x7f4ba23ff950 (LWP 5826)] [Thread 0x7f4ba23ff950 (LWP 5826) exited] [New Thread 0x7f4ba04ff950 (LWP 5827)] [Thread 0x7f4ba04ff950 (LWP 5827) exited] [New Thread 0x7f4ba04ff950 (LWP 5828)] [Thread 0x7f4ba04ff950 (LWP 5828) exited] [New Thread 0x7f4ba04ff950 (LWP 5829)] [Thread 0x7f4ba04ff950 (LWP 5829) exited] [New Thread 0x7f4ba23ff950 (LWP 5830)] [New Thread 0x7f4b9f0cb950 (LWP 5831)] [New Thread 0x7f4ba04ff950 (LWP 5832)] [Thread 0x7f4ba04ff950 (LWP 5832) exited] [New Thread 0x7f4ba04ff950 (LWP 5833)] [New Thread 0x7f4b9e3fa950 (LWP 5834)] [New Thread 0x7f4b9d9ff950 (LWP 5835)] [Thread 0x7f4b9d9ff950 (LWP 5835) exited] [New Thread 0x7f4b9d9ff950 (LWP 5836)] [Thread 0x7f4b9d9ff950 (LWP 5836) exited] [New Thread 0x7f4b9cdff950 (LWP 5837)] [Thread 0x7f4b9cdff950 (LWP 5837) exited] [New Thread 0x7f4b9d9ff950 (LWP 5838)] -----!----- THIS IS WHERE I HIT THE CLOSE BUTTON -----!----- [Thread 0x7f4b9d9ff950 (LWP 5838) exited] [Thread 0x7f4ba3dff950 (LWP 5823) exited] [Thread 0x7f4ba23ff950 (LWP 5830) exited] [Thread 0x7f4b9f0cb950 (LWP 5831) exited] [Thread 0x7f4ba32ff950 (LWP 5824) exited] [Thread 0x7f4ba04ff950 (LWP 5833) exited] [Thread 0x7f4ba7af1950 (LWP 5818) exited] [Thread 0x7f4b9e3fa950 (LWP 5834) exited] [Thread 0x7f4ba57ff950 (LWP 5822) exited] [Thread 0x7f4ba62ff950 (LWP 5820) exited] [Thread 0x7f4ba70e6950 (LWP 5819) exited] b�RENDER -----!----- THIS IS WHERE I HIT CTRL-C -----!----- ^C Program received signal SIGINT, Interrupt. [Switching to Thread 0x7f4bbb831700 (LWP 5813)] 0x00007f4bba4f8742 in select () from /lib/libc.so.6 (gdb) Quit (gdb)