Check if Javascript is enable , go to '''about:config''' search for '''javascript.enabled''' change its value to '''true'''. *[http://kb.mozillazine.org/About:config about:config]

Make sure that you do not block JavaScript. *http://kb.mozillazine.org/JavaScript *https://support.mozilla.org/kb/JavaScript Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance). *Do NOT click the Reset button on the Safe Mode start window. *https://support.mozilla.org/kb/Safe+Mode *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes