Many site issues can be caused by corrupt cookies or cache&#46; '''Warning ! ! ''' This will log you out of sites you're logged in to&#46; You may also lose any settings for that website&#46; * [https://support&#46;mozilla&#46;org/en-US/kb/delete-cookies-remove-info-websites-stored Delete cookies to remove the information websites have stored on your computer] {web link} * [https://support&#46;mozilla&#46;org/en-US/kb/how-clear-firefox-cache How to clear the Firefox cache] {web link} If there is still a problem, '''[https://support&#46;mozilla&#46;org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link} by holding down the '''<Shift> ''(Mac=Options)''''' key, and then starting Firefox&#46; A small dialog should appear&#46; Click '''Start In Safe Mode''' (not Refresh)&#46; Did this help? While you are in safe mode; Try disabling graphics hardware acceleration in Firefox&#46; Since this feature was added to Firefox it has gradually improved but there are still a few glitches&#46; ''[https://support&#46;mozilla&#46;org/en-US/kb/forum-response-disable-hardware-acceleration How to disable Hardware Acceleration]'' {web link}

Thanks Fred - your solution advice did the trick :)

Hello, I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution. Thank you for contacting Mozilla Support.

Hi - I solved my problem by deleting cookies.