You can check that JavaScript is enabled and isn't blocked.

• javascript.enabled should be true on the about:config page

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

• http://kb.mozillazine.org/JavaScript
• https://support.mozilla.org/kb/JavaScript

Start Firefox in Safe Mode 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

Make sure your Java (Not JavaScript) is up to date Verify Java and Find Out-of-Date Versions {web link}

Version 8 Update 60 Release date August 18, 2015

If the above doesn't help...

Sometimes a website will say that JavaScript seems to be disabled even when it is enabled. Possible causes for this are:

• A script that starts a plugin, such as Flash, is not working, and the script simply identifies the problem incorrectly
• An add-on is filtering the page, for example, blocking some scripts or ads, and another script in the page detects the missing element and identifies the problem incorrectly
• An external program such as a security suite is selectively blocking some scripts, and another script in the page detects the missing element and identifies the problem incorrectly