The latest update to the Firefox 3.5 version has been released. It contains fix fixes, three of which are critical. For full details of the release see the Bug List from Mozilla, or the Firefox 3.5.5 Release Notes.
No update for the 3.0 version of Firefox was made.
Cloud Testing has updated it’s cloud testing agents with this release.
For a full list of browsers supported by the Cloud Testing functional website testing service, visit the Cloud Testing website at www.cloudtesting.com.
Posted by Phil Smith - Cloud Testing 
Even though we think that this is a positive thing, it is likely to cause some confusion until users get used to it.