Hi straced it (strace /opt/thunderbird/thunderbird), for stracing thunderbird-bin fails complaining libjmoz.so is not to be found. But news to me is that: as user, Mozilla/Thunderbird/... crashes as root, works. Especially Thunderbird lets me, as a user, set up a email account, and then, as soon as I click "Ok" dies. And won't start anymore. Remove .thunderbird dir, same steps, cnfigure email address, and the dies again... As root, it seems to work seamlessly... I tried my old user, and I have created a new one, same results. Sigh... the strace is here (last lines at least) rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 stat64("core", 0xbffff030) = -1 ENOENT (No such file or directory) rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, [INT CHLD], [], 8) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x40015e28) = 10119 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 rt_sigaction(SIGINT, {0x80749a0, [], SA_RESTORER, 0xb21a18}, {SIG_DFL}, 8) = 0 waitpid(-1, [WIFEXITED(s) && WEXITSTATUS(s) == 11], 0) = 10119 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 --- SIGCHLD (Child exited) @ 0 (0) --- waitpid(-1, 0xbfffef04, WNOHANG) = -1 ECHILD (No child processes) sigreturn() = ? (mask now []) rt_sigaction(SIGINT, {SIG_DFL}, {0x80749a0, [], SA_RESTORER, 0xb21a18}, 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 stat64("core", 0xbffff280) = -1 ENOENT (No such file or directory) rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 read(255, "\nexit $exitcode\n", 8192) = 16 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 exit_group(11) = ?