You will see displayed all the setting, which starts with the letter “j.” Press on the desired settings under “Preference Name” and then click the “j” key. When you type the needed term in the search bar, you clear away the entries you do not need right now. Every set has a preference name, a status, a type, and a value. You can see the list of available settings in the alphabetical order.
You must type “javascript.enabled” in the search bar. If you have doubts, think twice before applying these advanced changes. Note that the settings in the configuration menu should be used by advanced PC users, that is why you should press “Continue” when you see the warning message “I’ll be careful, I promise.” Mozilla Firefox wants to be sure you are familiar with advanced settings, and you know what you do. The only thing you must do is to add the bookmark “Ctrl + D.” Later you can come back to the configuration menu even without typing. 
Next, you should type “about:config” into the Firefox address bar and click “Enter” to open a configuration menu.In case you have Firefox already open, you must click “Ctrl + T” to open a new tabbed window.
The icon of Firefox is well-known for its cute illustration of a fox curled around a blue-colored globe.
Now, you need to open the Firefox browser. To do this press “Alt + H” to enable the “Help” menu and press “About Firefox.” In our tutorial we work with Mozilla Firefox 23 and up versions. First of all, you must check which Mozilla Firefox version you have installed on your computer. How to Enable JavaScript in Mozilla Firefox How to Enable JavaScript in Mozilla Firefox.
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