The firefox-3.6-0.4.beta4 replace the version 3.5.

 

WARNING : a backup of your profile (.mozilla/firefox directory) seems mandatory.

Start by reading :

As always :

yum --enablerepo=remi update firefox

No xulrunner update, this RPM provides his bundled Gecko engine.

Actually the some extensions are not compatibles and will be disabled.

RPM are available for Fedora ≥ 8.