Mozilla has released an updated version, 10.0.1, of the Firefox browser for Windows, Linux, and Mac OS X. This version corrects a critical security vulnerability in the recently-released Firefox 10, as well as a bug affecting Java applets. More details are available in the Release Notes.
You can get the new version via the built-in update mechanism (Help / About Firefox / Check for Updates), or you can download an installation package, in your language of choice. Because of the security fix, I recommend that you upgrade your system to the new release as soon as you conveniently can.
Mozilla is indicating that version 10.0.1 will continue to be an Extended Support release.
Posted by Rich 
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