On Wed, 2015-03-25 at 21:00 -0600, Frank Cox wrote: > On Thu, 26 Mar 2015 02:51:52 +0000 > Always Learning wrote: > > > How can I identify the cause of the problem ? > mv ~/.mozilla mozilla-old > firefox > > See what happens. It now works, Thank You. (1) renamed the directory. (2) yum upgrade firefox = 31.5.3 (3) started Firefox and got a horrible nightmare - ugly tabs, no menu bar and all my familiar settings gone. It was a real devastating and emotional shock. It prompted me to do a backup ! (4) closed Firefox (5) renamed the new directory *-crap (6) restored the previous directory (7) restarted Firefox and everything was familiar and wonderful again. Thanks for your very effective solution. Paul. England, EU. Je suis Charlie.