I've recently upgraded to Firefox 12 and every time I open gmail it says I need to upgrade to a newer version. I've reloaded 3 times already and it still happens. What gives?
Your User Agent shows that your are using Firefox 3.6.16 (click "More system details" to the right of your original question and scroll down to see:
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:18.104.22.168) Gecko/20110319 BTRS26718 Dealio Toolbar 3.1 Firefox/3.6.16 ( .NET CLR 3.5.30729) FBSMTWB
See --> https://support.mozilla.org/en-US/kb/Finding%20your%20Firefox%20version
The problem with your User Agent being changed could be caused by Fast Browser Search (FBSMTWB) being installed on your system:
Remove Fast Browser Search
THEN, reset your User Agent:
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Not related to your question, but...
You may need to update some plug-ins. Check your plug-ins and update as necessary: