Please dont file bugs with build older than 2 weeks, bugzilla cleary states this. 0.9.2 is out-dated. Going to marks this one as WORKSFORME, please reopen only if you can reproduce this with at least Firefox 1.0 Preview Release or nightly branch build AND a fresh profile.
Also, be sure y ou uninstall 0.9 before installing new version.
You are correct, upgrading fixes this. This bug is fixed with user agent string: Mozilla/5.0 (Windows; U; Windows NT 5.1; rv:1.7.3) Gecko/20040913 Firefox/0.10
BTW -- thanks for making the best browser on the market! Everyday I see more and more people appreciating your hard work!