I would like to use firefox as the #1 & want to be able to go on Safari on ocassion
Go to www.getfirefox.com and download and install the latest version. You can also read How to download and install Firefox on Mac for more help.
You may have a corrupted user agent that identifies you as Firefox/3.6.8
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:184.108.40.206) Gecko/20100722 Firefox/3.6.8 Glue/4.5
If you set Firefox as the default browser then that is your main browser.
You can still start other browser just like you did before via their icons or otherwise.