I'd already hijacked Bill's 6.0 thread and did not wish to do so further.
In another thread, and recently, there was a notation about either a mobile device or handhelds using the FF Ver 3. Could not recall the topic for reference.
My sites have always seem to attract diverse browsers, UA's and other diverse criteria, although on smaller traffic scales than most.
Today this ATT user entered on a refer:
"Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:188.8.131.52) Gecko/20110420 Firefox/3.6.17 ( .NET CLR 3.5.30729; .NET4.0C) MindQuizSearchToolbar/1.2 FBSMTWB"
grabbing the page and all images.
85-minutes later from the same IP; PAGE ONLY
"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:184.108.40.206) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)"
Note the change in both the UA and FF version.
Note; also the trailing extra space (in both visits) in the NET section.
I suppose its possible considering the area (a major metro) that these two are different users on the same IP, however the coincidence is too much to disregard.