The part I forgot to mention in above message is though the message report firefox.py crashed but it did not crashed actually. I have been typing the emails while bug report was being generated. Here is the strace output on my system execve("/usr/bin/firefox", ["firefox"], [/* 38 vars */]) = 0 brk(0) = 0x1d8f000 access("/etc/ld.so.nohwcap", F_OK) = 0 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1959e55000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=102399, ...}) = 0 mmap(NULL, 102399, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f1959e3c000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\355\1\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1572232, ...}) = 0 mmap(NULL, 3680296, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19598b4000 mprotect(0x7f1959a2e000, 2093056, PROT_NONE) = 0 mmap(0x7f1959c2d000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x179000) = 0x7f1959c2d000 mmap(0x7f1959c32000, 18472, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1959c32000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1959e3b000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1959e3a000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1959e39000 arch_prctl(ARCH_SET_FS, 0x7f1959e3a700) = 0 mprotect(0x7f1959c2d000, 16384, PROT_READ) = 0 mprotect(0x617000, 4096, PROT_READ) = 0 mprotect(0x7f1959e57000, 4096, PROT_READ) = 0 munmap(0x7f1959e3c000, 102399) = 0 getpid() = 2954 rt_sigaction(SIGCHLD, {SIG_DFL, [CHLD], SA_RESTORER|SA_RESTART, 0x7f19598e7af0}, {SIG_DFL, [], 0}, 8) = 0 geteuid() = 1000 brk(0) = 0x1d8f000 brk(0x1db0000) = 0x1db0000 getppid() = 2953 stat("/home/tapas", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 open("/usr/bin/firefox", O_RDONLY) = 3 fcntl(3, F_DUPFD, 10) = 10 close(3) = 0 fcntl(10, F_SETFD, FD_CLOEXEC) = 0 rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGINT, {0x408189, ~[RTMIN RT_1], SA_RESTORER, 0x7f19598e7af0}, NULL, 8) = 0 rt_sigaction(SIGQUIT, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGQUIT, {SIG_DFL, ~[RTMIN RT_1], SA_RESTORER, 0x7f19598e7af0}, NULL, 8) = 0 rt_sigaction(SIGTERM, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGTERM, {SIG_DFL, ~[RTMIN RT_1], SA_RESTORER, 0x7f19598e7af0}, NULL, 8) = 0 read(10, "#!/bin/sh\n\n# Firefox launcher co"..., 8192) = 4575 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f1959e3a9d0) = 2955 close(4) = 0 read(3, "/usr/bin/firefox\n", 128) = 17 read(3, "", 128) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- close(3) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 2955 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f1959e3a9d0) = 2956 close(4) = 0 read(3, "firefox\n", 128) = 8 read(3, "", 128) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- close(3) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 2956 stat("/usr/lib/firefox-3.6.8/firefox", {st_mode=S_IFREG|0755, st_size=3933, ...}) = 0 stat("/home/tapas/.mozilla/firefox", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/tapas/.mozilla/firefox-3.1", 0x7fff944ee860) = -1 ENOENT (No such file or directory) stat("/home/tapas/.mozilla/firefox-3.5", 0x7fff944ee860) = -1 ENOENT (No such file or directory) stat("/home/tapas/.mozilla/firefox-3.6", 0x7fff944ee860) = -1 ENOENT (No such file or directory) execve("/usr/lib/firefox-3.6.8/firefox", ["/usr/lib/firefox-3.6.8/firefox"], [/* 39 vars */]) = 0 brk(0) = 0x1afb000 access("/etc/ld.so.nohwcap", F_OK) = 0 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8fd1e0f000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=102399, ...}) = 0 mmap(NULL, 102399, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f8fd1df6000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\355\1\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1572232, ...}) = 0 mmap(NULL, 3680296, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8fd186e000 mprotect(0x7f8fd19e8000, 2093056, PROT_NONE) = 0 mmap(0x7f8fd1be7000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x179000) = 0x7f8fd1be7000 mmap(0x7f8fd1bec000, 18472, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f8fd1bec000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8fd1df5000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8fd1df4000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8fd1df3000 arch_prctl(ARCH_SET_FS, 0x7f8fd1df4700) = 0 mprotect(0x7f8fd1be7000, 16384, PROT_READ) = 0 mprotect(0x617000, 4096, PROT_READ) = 0 mprotect(0x7f8fd1e11000, 4096, PROT_READ) = 0 munmap(0x7f8fd1df6000, 102399) = 0 getpid() = 2954 rt_sigaction(SIGCHLD, {SIG_DFL, [CHLD], SA_RESTORER|SA_RESTART, 0x7f8fd18a1af0}, {SIG_DFL, [], 0}, 8) = 0 geteuid() = 1000 brk(0) = 0x1afb000 brk(0x1b1c000) = 0x1b1c000 getppid() = 2953 stat("/home/tapas", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 open("/usr/lib/firefox-3.6.8/firefox", O_RDONLY) = 3 fcntl(3, F_DUPFD, 10) = 10 close(3) = 0 fcntl(10, F_SETFD, FD_CLOEXEC) = 0 rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGINT, {0x408189, ~[RTMIN RT_1], SA_RESTORER, 0x7f8fd18a1af0}, NULL, 8) = 0 rt_sigaction(SIGQUIT, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGQUIT, {SIG_DFL, ~[RTMIN RT_1], SA_RESTORER, 0x7f8fd18a1af0}, NULL, 8) = 0 rt_sigaction(SIGTERM, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGTERM, {SIG_DFL, ~[RTMIN RT_1], SA_RESTORER, 0x7f8fd18a1af0}, NULL, 8) = 0 read(10, "#!/bin/sh\n#\n# ***** BEGIN LICENS"..., 8192) = 3933 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f8fd1df49d0) = 2957 close(4) = 0 read(3, "/usr/lib/firefox-3.6.8\n", 128) = 23 read(3, "", 128) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- close(3) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 2957 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f8fd1df49d0) = 2958 close(4) = 0 read(3, "firefox\n", 128) = 8 read(3, "", 128) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- close(3) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 2958 stat("/usr/lib/firefox-3.6.8/run-mozilla.sh", {st_mode=S_IFREG|0755, st_size=10469, ...}) = 0 geteuid() = 1000 getgid() = 1000 getegid() = 1000 getgroups(0, NULL) = 9 getgroups(9, [4, 20, 24, 46, 105, 119, 122, 124, 1000]) = 9 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f8fd1df49d0) = 2959 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 2959 --- SIGCHLD (Child exited) @ 0 (0) --- exit_group(0) = ?