Por lo que he visto, la v1.0.2 tiene varios bugs corregidos y sobre todo actualizaciones de seguridad.
Salu2.
Añado un resumen de lo que he encontrado en una página de Flexbeta en donde hace un resumen de todas las versiones de este navegador… También hay algo sobre la futura v1.1. Sorry, está en inglés.
Salu2 de nuevo.
Firefox 1.0.1
Most of the changes in Firefox 1.0.1 were security fixes and stability fixes. Some of the security exploits that were patched included an exploit which allowed an attacker to spoof the download and security dialog by covering them partially using popup windows. Also, an exploit existed where an image that was dragged and dropped allowed the creation of executable files.
Firefox 1.0.2
Firefox 1.0.2 is the last build before Firefox hits the 1.1 milestone. Available now, Firefox 1.0.2 pretty much was released for the same reasons that 1.0.1 was released: bug fixes and security fixes. The four security threats that Firefox 1.0.2 fixed were:
Drag and drop loading of privileged XUL
Arbitrary code execution from Firefox sidebar panel
GIF heap overflow parsing Netscape extension 2
SSL spoofing vulnerability: status bar disappears in small windows; popups can spoof the SSL lock.
Firefox 1.1
Though still in the development phase, Firefox 1.1 is planned to include a several bug and security fixes along with an MSI package. Firefox 1.1 will also see an enhancement to the extensions manager which will make it easier for third party applications to register and deregister extensions that live with their code. The current Firefox installer will also give the user the option on where to place the Firefox logo/icon; on the start-up, desktop or quick launch toolbar.