,Thanks JustAnswerThis is Leela and I will help you with the question todayWish you a very happy new year 2015
the problem is most likely caused by problem in extensions
please start firefox in safe mode and check if you see the problem
please refer to below link details
please let me know if starting firefox in safe mode resolves the problem or not
if starting firefox in safemode resolves the problem the problem is because of FIREFOX ADDON
Thank you help, the problem is now resolved following your advice. Happy New Year to you may you have what you wish 2015.