Type firefox in your xterm and look for error messages.You may move your profile in ~/.mozilla/firefox/ to ~/.mozilla/firefox-original/ and create a new one at the next startup.Sometimes faulty plugins cause the firefox to crash. Move the plugins-directory in /opt/firefox, /usr/local/firefox or similar.If firefox runs as root you may have to change the owner and permissions.
Type firefox in your xterm
Type firefox in your xterm and look for error messages.You may move your profile in ~/.mozilla/firefox/ to ~/.mozilla/firefox-original/ and create a new one at the next startup.Sometimes faulty plugins cause the firefox to crash. Move the plugins-directory in /opt/firefox, /usr/local/firefox or similar.If firefox runs as root you may have to change the owner and permissions.