I unzipped with tar -zxvf <filename> to the directory /usr/lib, checked that /usr/lib was in PATH with echo $PATH, and issued a 'firefox' command in terminal.
It runs, but I was just wondering if the terminal is supposed to 'hang', that is, should i be able to use the same terminal for other commands as it doesn't give me a new user prompt - I have to open a new terminal tab to do anything else.