Hi,

Firefox 10 is the latest version, it was released on January 31, 2012. Where are these messages being displayed?

On the Firefox start page Just below the Google search box

Change your homepage - How to set the homepage

This - http://www.google.com/firefox - is the old Firefox Start Page used by the Firefox 3.6 and earlier versions of Firefox. I think that Google assumes that you are using an older version of Firefox, as they hard-coded that "upgrade" message into that page - all versions of Firefox see that message.

Starting with the Firefox 4 version, Firefox is using a "local" Start Page with the address of about:home. It looks similar to the old Start Page, but it isn't exactly the same.