That doesn't mean they're not useful or worthwhile, though most of the changes are aimed at developers.
Users may benefit from the way the domain name is highlighted in the address bar (making it a little harder to be fooled by bogus sites) plus the more prominent identity block. And there's faster browser startup when using the Panorama (tab groups) feature, and greater visibility of Firefox Sync (a service for synchronising history, bookmarks tabs and passwords across multiple devices running Firefox).
On the developer front, improvements and additions cover the latest WebSockets draft, EventSource (events triggered by messages streaming from a server), and window.matchMedia (to help optimise content to the characteristics of the particular output device, such as the width of the window).
There are security fixes too - please read on.
Firefox can be downloaded here.
Firefox 7 is expected to bring more substantial changes in October.