The following are the Minor changes in Firefox 10.
- The forward button is now hidden until you navigate back.
- Most add-ons are now compatible with new versions of Firefox by default.
- Full Screen APIs allow you to build a web application that runs full screen.
- added IndexedDB APIs to more closely match the specification.
- Mac OS X only – after installing the latest Java release from Apple, Firefox may crash when closing a tab with a Java applet installed.
- Some users may experience a crash when moving bookmarks.
For more complete list of changes in Firefox 10.