1) In the address bar, type "about:config", and press Enter.
2) Click "I'll be careful, I promise".
3) In the search bar, search for "javascript.enabled". If the "Value" tab is "false", then it means that JavaScript is disabled. If it is “true”, then JavaScript is enabled.
4) Right click on it and select "Toggle" if you want to change this.
1) Enter the Configuration page by typing “about:config” on the address bar of Firefox.
2) Use the Search bar and type “javascript”. You should now see the “javascript.enabled” option.
3) Tap on “Toggle” to change the value of the box (“true to enable”, “false” to disable).
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