Patches released for Firefox 3.0.17 and 3.5.7 – update to 3.0.18 or 3.6

If you are using 3.0.17, you can do a check for updates.
3.5.7 users are really being directed to version 3.6 it seems.

http://www.mozilla.com/en-US/products/download.html?product=firefox-3.5.8&os=win&lang=en-US