How to Enable JavaScript in Mozilla Firefox

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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

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    Get to the Menu [1] . 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.
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    You will see a prompt warning that you might void your warranty, click, “I Will be Careful, I promise!”
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    In the search box, type “JavaScript” to search for the option. You’ll see “javascript.disabled.”
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    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.
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    The value column to the right after “javascript.enabled” should be “true.” If it’s not, try the last step again.
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Method 2
Method 2 of 3:

Using SettingSanity

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    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.
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    In the address bar, type “about:preferences.” Click “Content," the third tab on the left of the page.
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    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.
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Method 3
Method 3 of 3:

Disabling JavaScript on Specific Sites Using NoScript Security Suite

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    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.
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    It will probably be near the menu in the top right of the page.
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    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]...”
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      Tips

      • To disable JavaScript universally using about:config, simply change the value from “false” to “true” by right-clicking and selecting toggle.
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      Warnings

      • Be careful with about:config. Changing settings without being sure what will happen can put your browser’s security at risk.
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      • Universally disabling JavaScript will cause your browser to malfunction.
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      References

      1. ↑ http://kb.mozillazine.org/JavaScript#JavaScript_settings_in_Firefox_23_and_above

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