The version you have is the one mentioned in the first paragraph or so of my post. The discussion I saw of which versions would get automatic updates was a little coonfoozing to me, since I don't really have a good idea of what people are using.
Since v2.0.0.2 appears to have been released within the past week or so, if you have it you almost certainly were treated to an automatic update.
Some have commented about prefering older versions. They should note the comment that (security) support for (some?) older ones will terminate soon. - Firefox 1.5.0.x will be maintained ... . above.