The PortableApps.com release of Firefox 10 Beta3 is taking a long time so I decided to use the internal Firefox updater instead of waiting for and update to be available from the PA.c Updater.
I started PA > clicked on Mozilla Firefox, Portable Edition (9 Beta) > after Firefox started, I clicked on Help > clicked on About Firefox > clicked on Check for Updates > Downloaded and installed the update in that window > restarted Firefox.
When I click on Help > About Firefox, it now appears "10.0" below Firefox logo.
However, I have some questions: