Thank you for the suggestions, but it didn't work. I installed it in /usr/local/firefox in SU mode. Firefox opened right after it finished installing. I still can not open it with a normal user. I looked at the permissions for the executable file.
User: Read, Write, Exec
Group: Read, Exec
Others: Read, Exec
Are these settings correct?Is there anything else I can try? Thank you again for all the help.