Program directory help...
 

In order to execute a program by simply typing in the command, such as "mozilla" or "firefox", what directory does it need to be installed to?

Those are the directory which the OS will search for binaries to execute when you type just the prog name.

Forefox and mozilla from Slackware-current packages is installed in /usr/lib/firefox-version and /usr/lib/mozilla-version respectively.

But it has a symbolic link from /usr/lib/firefox-version/firefox /usr/bin/firefox same goes for mozilla.

I hope you get what I meant

If not just ln -s /where/you/install/firefox/firefox /usr/bin/firefox

I'm starting to understand the symbolic links. I think I can manage getting firefox and thunderbird up now, thanks for the help.

For some reason, firefox won't startup as a normal user.

It starts to open and asks me to select a profile, but when I do, it simply doesn't open.

However, if I su to root, it works perfectly.