In order to enable JavaS­cript in Firefox, you need to use the command about:config. By default, the scripting language is enabled in all popular browsers and should only be disabled under special cir­cum­stances.

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Step-by-step in­struc­tions on how to enable JavaS­cript in Firefox

Want to enable JavaS­cript for Firefox? You can enable the scripting language in the Config file of your browser. Since other settings that can po­ten­tially affect the func­tion­al­ity of your browser can also be changed in this file, it’s best to closely follow the steps outlined below:

  1. First open Firefox.
  2. In the address bar at the top, type about:config and then press Enter. This will open the settings.
  3. Most likely a warning message will appear informing you that changing the settings can neg­at­ively impact the per­form­ance and security of the browser. If you don’t want to see this notice again, you can untick the box by clicking on it. To proceed to the settings, click Accept the Risk and Continue.
Image: Screenshot of the warning page that appears when running the command about:config
A warning page appears when you run the command about:config.
  1. A new page opens that contains a search field directly below the address bar. In the search field, type javascript.enabled.
  2. While you are typing, various options will be displayed. Once you have entered the search term com­pletely, there should only be one option left. On the left side, you should see ‘javas­cript.enabled’ and in the middle, the Boolean value ‘true’ or ‘false’. If ‘true’ is shown, JavaS­cript is currently enabled. ‘False’, on the other hand, means JavaS­cript is currently disabled.
  3. If you want to change the Boolean value in order to disable or enable JavaS­cript in Firefox, click on the two-way arrow symbol on the right.
Image: Screenshot of page for enabling JavaScript in Firefox
You can enable JavaS­cript by setting the Boolean value to ‘true’.
  1. To finish, restart your browser. The changes you have made to settings will be applied and JavaS­cript will either be enabled or disabled.

Why should you enable JavaS­cript in Firefox?

JavaS­cript is a browser-based scripting language that ensures that dynamic elements of a website are displayed as intended. This is why all modern web browsers have the language enabled by default. Disabling the language can cause many in­ter­act­ive websites to not function properly. Videos, updates, ads, dropdown menus and dialog boxes often rely on JavaS­cript. Ad­di­tion­ally, data is sometimes stored and retrieved through the scripting language. In most cases, it’s best to have JavaS­cript enabled in Firefox.

Tip

It’s also possible to enable or disable JavaS­cript if you are using a different browser. In our Digital Guide, you can find easy-to-un­der­stand in­struc­tions for enabling JavaS­cript in different popular browsers:

You can also find out how to set or change your homepage in Firefox.

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