Firefox 4 is out. I downloaded it and it seems to work fine. But I have to navigate to the directory where I downloaded (and expanded) it and click on the firefox icon in that directory.
If I use the little blue marble at the bottom of the page, as I am used to doing, I get an older version of firefox.
Actually, in reviewing this, I asked the wrong question. I have the little blue marble going to /src/seamonkey and that works fine. And I know how to change it. What I am doing with firefox is going to the command line at Alt-F2 and that brings up the older firefox.
Now, even when I migrate to where I expanded firefox 4, I still get the older version. However, I swear the first time I did it I got firefox 4