In the options link from the tools menu, click the Web Features icon and see if javascript is turned on. If it is off, the editor won't work.
Not sure what else it could be if javascript is on and the editor doesn't work, you might look at other settings for firefox and see if changing them fixes it.
If all else fails, uninstall and re-install firefox, it certainly should work fine with the html editor unless there is some problem with your installation.
YES
click the Web Features icon and see if Javascript is turned on. If it is off, the editor won't work.
Thanks Michael Javascript was off , youre' a champion
Thanks Michael Javascript was off , youre' a champion