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Many site issues can be caused by corrupt cookies or cache. * Clear the Cache Press the '''<Alt>''' or '''<F10>''' key to bring up the tool bar. Followed by; Windows; '''Tools > Options''' Linux; '''Edit > Preferences''' Mac; ''application name'' '''> Preferences''' Then '''Advanced > Network > Cached Web Content: Clear Now''' and * Remove Cookies Press the '''<Alt>''' or '''<F10>''' key to bring up the tool bar. Followed by; Windows; '''Tools > Options''' Linux; '''Edit > Preferences''' Mac; ''application name'' '''> Preferences''' Then '''Privacy.''' Under '''History''', select Firefox will '''Use Custom Settings'''. There is a button on the right side called '''Show Cookies'''. If there is still a problem, '''''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''''' {web link} While you are in safe mode; Press the '''<Alt>''' or '''<F10>''' key to bring up the tool bar. Followed by; Windows; '''Tools > Options''' Linux; '''Edit > Preferences''' Mac; ''application name'' '''> Preferences''' Then '''Advanced > General.''' Look for and turn off '''Use Hardware Acceleration'''. Poke around safe web sites and see if there is still a problem. Then restart.