Only for advanced users that know what they do!
Users with firefox that wanna go on without Java,
will find that Oracle will not uninstall everything firefox related and leaves debri behind
Whenever everything in combination with Java has been uninstalled,
just open up regedit, go to key HKEY_LOCAL_MACHINE\Software\MozillaPlugins
delete all subkeys there starting with @java.com.
Also delete the subkey HKEY_CLASSES_ROOT\CLSID\{CAFEEFAC-DEC7-0000-0001-ABCDEFFEDCBA}.
Moreover also delete file: C:\WINDOWS\system32\npDeployJava1.dll.
Before doing this make a copy of your registry in case anything goes wrong,
polonus