How to Enable JavaScript in Mozilla Firefox

Co-authored by wikiHow Staff

Last Updated: March 31, 2023 Tested

Although JavaScript is turned on by default in Mozilla Firefox, you can disable it for speed, bandwidth, and safety concerns in your configuration settings. This wikiHow will teach you how to edit your Firefox configuration to reenable JavaScript.

Method 1

Method 1 of 3:

Enabling JavaScript Manually Using about:config

1
Get to the Menu^{[1]
X
Research source}. Type "about:config" in Firefox’s address bar, at the very top of the page to go to the browser configuration. If you want to enable JavaScript universally, this is the quickest and easiest way.
2
Agree to the Warnings. You will see a prompt warning that you might void your warranty, click, “I Will be Careful, I promise!”

Advertisement
3
Find JavaScript. In the search box, type “JavaScript” to search for the option. You’ll see “javascript.disabled.”
4
Enable JavaScript. Right mouse click on “javascript.disabled” and click toggle in the dropdown menu. The value will change to “true," and the text will be bolded.
5
Check that it’s Enabled. The value column to the right after “javascript.enabled” should be “true.” If it’s not, try the last step again.

Method 2

Method 2 of 3:

Using SettingSanity

1
Install the Add-On. This is another easy option if you want to universally enable JavaScript on all websites, but are intimidated by about:config. This add-on will allow you to enable or disable JavaScript in the “about:preference” menu. You can search “SettingSanity” on addons.mozilla.org. Click, “Add to Firefox," then “Install.” You will have to restart your browser.
2
Go to “about:preferences.” In the address bar, type “about:preferences.” Click “Content," the third tab on the left of the page.
3
Enable JavaScript. Under “Images and JavaScript," you’ll see “Enable JavaScript.” Click the checkbox next to it so that it’s filled. JavaScript is now enabled on your browser.

Method 3

Method 3 of 3:

Disabling JavaScript on Specific Sites Using NoScript Security Suite

1
Download the Add-On. This is a security add-on for advanced users that allows you to customize what scripts run on your browser, or where JavaScript will work. You can look here, or search “NoScript” on addons.mozilla.org. Click, “Add to Firefox,” then “Install.” You will have to restart your browser.
2
Click the “S” logo for NoScript. It will probably be near the menu in the top right of the page.
3
Select the Script to Block. Under the dropdown menu that comes from clicking on the “S” logo, you can allow, temporarily allow, or block scripts at your discretion by clicking, “Forbid [x]...”

Warnings

Be careful with about:config. Changing settings without being sure what will happen can put your browser’s security at risk.

⧼thumbs_response⧽
Helpful 1 Not Helpful 0
Universally disabling JavaScript will cause your browser to malfunction.

⧼thumbs_response⧽
Helpful 1 Not Helpful 0