How to Enable JavaScript in Mozilla Firefox

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


Enable and Disable JavaScript in Firefox

To turn on JavaScript in Firefox, first, launch the Firefox app on your computer. In Firefox’s address bar at the top, type the following and press Enter:


Type "about:config" in Firefox's address bar.

You will see a “Proceed with Caution” notice. Here, click the “Accept the Risk and Continue” button.

Select "Accept the Risk and Continue" in the prompt.

On the page that opens, in the “Search Preference Name” box at the top, type the following:


Type "JavaScript" in the "Search Preference Name" box.

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 turn to “true,” which indicates 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!

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