How to Enable JavaScript in Mozilla Firefox

If you come across a site that asks you to enable JavaScript, or if you want to run your own scripts, you must first enable JavaScript in your Mozilla Firefox browser. Here’s how to do just that.

In Firefox, JavaScript is enabled by default. However, if you or another user disabled it, it’s easy to re-enable it. Also note that the instructions in this guide apply to the desktop version of Firefox. In mobile Firefox, JavaScript is always enabled.

RELATED: What is JavaScript and why is Gmail blocking it?

Enable and Disable JavaScript in Firefox

To enable JavaScript in Firefox, first launch the Firefox application on your computer.

In the Firefox address bar at the top, type the following and press Enter:

about:config

Type

You will see a “Proceed with caution” notice. Here, click on the “Accept the risk and continue” button.

To select

On the page that opens, in the “Name of search preference” box at the top, type the following:

JavaScript

Type

You will see several search results. Here, to enable JavaScript, next to the “javascript.enabled” value, click the toggle button

Enable JavaScript in Firefox.

The value next to “javascript.enabled” will change to “true”, indicating that the feature is now enabled in the browser.

JavaScript enabled in Firefox.

To disable JavaScript again in Firefox, next to the “javascript.enabled” value, click the toggle button again.

And that’s how you allow (and disallow) JavaScripts in Firefox!


Need to enable or disable JavaScript in Chrome? If so, there is an equally simple way to do it.

RELATED: How to Disable (and Enable) JavaScript in Google Chrome

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