I have been updating firefox regularly for about a year with no problems so far.Are we supposed to update Firefox, or not?
The best way i found is to run Firefox as root, as follows:
Click open a terminal window, type firefox then when firefox starts go to the help tab, go to about and firefox checks for latest updates and it updates itself.
Do a restart and check the about function until there are no more updates, then close the terminal window and now you are set.
Just run FF as default user spot, saving to the Downloads folder; then click on the Downloads desktop icon and move files elsewhere as needed.