How to Disable JavaScript in Firefox on PC or Phone

At times, you may wish to disable JavaScript on your device. If you are using Firefox, then it’s not that easy. But no worries, we have got the instructions below about how to turn off JavaScript on your PC or a phone. If you happen to use Firefox Focus, then also you can disable JavaScript if you are using an Android device.

Finally, if you need to enable JavaScript on certain pages as an exception, then that’s possible too. You will find a step-by-step guide with screenshots for that too below. Let’s jump in.

Related: How to Use Firefox Relay to Hide Your Email Address Online

How to disable JavaScript in Firefox on PC

Firefox on PC allows users to disable JavaScript for all websites from a single toggle button available in the Advanced Preferences settings. This is also referred to as the about:config page. Let’s see how you can access this page and subsequently disable JavaScript on all websites.

Open the Firefox web browser on your PC and click on the search bar at the top of your browser.

Type about:config in the search bar and press ENTER from your keyboard.

Click on the Accept the Risk and Continue button.

In typing area marked by “Search preference name”, type JavaScript.enabled and press ENTER from your keyboard.

Click the toggle button next to the JavaScript.enabled setting. This will make change its value from true to false.

JavaScript is now disabled on your Firefox web browser.

Note: Make sure you see “false” next to JavaScript.enabled before resuming your Firefox session.

Related: How to Restart Firefox on a Computer in 4 Ways

How to disable JavaScript in Firefox on iPhone and Android

JavaScript is enabled by default in Firefox on iOS. Not only that but unlike other web browsers on iOS like Safari, Firefox on iOS does not have an option to disable JavaScript.

However, workarounds do exist for Android devices. Firefox on Android allows you to apply Add-ons to your browser. These Add-ons have the ability to alter Firefox settings that are normally not accessible to users.

One of these add-ons, NoScript Security Suite is capable of disabling JavaScript in Firefox browser on Android devices. Here’s how you can do it.

Open the Firefox web browser from your Android device.

Tap the 3-dot icon near the bottom-left corner of your screen.

Tap Add-ons.

Scroll down and locate the NoScript Security Suite Add-on. Tap the + icon next to it.

Tap Add.

Wait for the download and verification process to finish.

Tap Okay, Got it.

Note: You can also apply this Add-on in private browsing by tapping the “Allow in private browsing” checkbox.

The Add-on is now installed.

To confirm if JavaScript is disabled, tap on the 3-dot icon.

Tap Add-ons.

Tap NoScript.

Tap the wrench icon on the right of the green reload option.

You can see that the default settings have the script option disabled.

Related: Best Firefox Relay Tips You Must Know

How to disable JavaScript in Firefox Focus on Android

While Firefox Focus on Android has a dedicated button to disable JavaScript, the same cannot be said about iOS.

Let’s see how to find and use this option on your Android device.

Open Firefox Focus from your Android device.

Tap the 3-dot icon near the upper-right corner of your screen.

Tap Settings.

Tap Privacy & Security.

Tap on the toggle button next to the Block JavaScript option. Purple-colored toggle means the Block JavaScript option is enabled.

JavaScript has now been disabled from Firefox Focus web browser.

Related: Firefox Relay vs Apple Hide My Email: What to Use and Why

What happens when you disable JavaScript?

JavaScript is a programming language that is used to add interactive elements to modern websites like menus, chats interfaces, video players, etc. In fact, most modern websites look complex and aesthetically beautiful thanks to JavaScript.

Naturally, disabling JavaScript will have a significant impact on the layout of websites you love to visit. For Example, let’s see what happens when you visit Gmail with JavaScript disabled.

Google will ask you to enable JavaScript if you want to use Gmail in standard view. However, you can also view Gmail in its basic HTML view, which does not require JavaScript. Click on the blue-colored click here option to see how that looks.

It looks quite old school.

However, not all websites can be viewed with javaScript disabled. Facebook is one of these websites. With JavaScript disabled, you can’t even view the website’s layout.

Accessing Twitter without javaScript will also be a fruitless exercise.

Can you manually enable JavaScript on the required pages?

Yes. It is possible to manually enable JavaScript on specific websites. Firefox on PC allows you to add extensions that can give you better control over the websites allowed to use JavaScript. Using one of these extensions you can disable or enable JavaScript on the websites you want to.

Disable JavaScript by David Pacassi Torrico is one of the best Firefox extensions that serve this exact purpose. With this extension installed, not only can you enable JavaScript for specific websites but you can also change the disable behavior to tab, i.e the selected tab will be the only one affected and not the domain as a whole.

How to manually enable JavaScript on certain pages

Manually enabling JavaScript is fairly easy. Follow the following 3 steps to enable JavaScript on specific websites.

Before you proceed, make sure your default setting for the javascript.enabled setting is false. Refer to the first guide in this article to check and change (if needed) this setting.

Step #01: Download Disable JavaScript extension

Open Firefox web browser on your PC and visit the following link: Disable JavaScript.

Tap Add to Firefox.

Tap Add.

Disable JavaScript extension (green toggle button) has now been added to your Firefox web browser. Tap Okay.

Note: You can also allow this extension to run in Private Windows by clicking the checkbox in the pop-up.

Step #02: Check the extension’s settings

Open Firefox web browser on your PC and click on the hamburger icon (3 horizontal lines) near the top-right corner of your browser window.

Click Add-ons and themes.

Click the extensions icon on the left side of your browser window.

Locate the Disable JavaScript extension and click the 3-dot icon next to it.

Click Options.

Make sure your settings match the ones described in the picture below. If not, change the settings accordingly.

Note: However, feel free to modify these settings according to your own preferences.

Step #03: Enable JavaScript on a specific website

Open Firefox web browser on your PC and visit the website you want to enable JavaScript on.

Click on the Disable JavaScript toggle button on the top-right corner of your browser window. Green means disabled while red means enabled.

JavaScript has been enabled on the domain displayed in the address bar. 

We hope this article helped you disable JavaScript in Firefox on the device of your choice. If you have any more questions, feel free to reach out to us using the comments section below.



  1. Honest question, besides being super paranoid, and perhaps using stone-age devices, why does someone want to disable JS at all?

    It is almost guaranteed you will get a bad and degraded experience all over the web, so why bother?
    There´s also other ways to improve security given you are THAT paranoid, from private mode (I know it barely protects), Virtual Machines, hardware firewalls, regular AV/AM software, and I bet a ton other options. I’m in no way a security expert, but I’m pretty sure there’s better ways than disabling JS.

    I honestly don’t get the point of hindering the web experience on purpose.

    1. Developers often need to disable JS while testing the code for their website and how their website looks with and without JS.

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