Disable JavaScript in Firefox - how it works

Here we show you how to turn off JavaScript in the Firefox browser and thereby increase security.

Disable JavaScript in the options

First of all: Some sites such as Youtube, Google and other websites require JavaScript. You cannot use this with deactivated JavaScript.

1. Navigate to the menu button at the top left (from Firefox 29 on top right). There you select the "Settings" option.
2. Click on "Contents" in the tab. In Firefox version 23 you will find a checkbox called "Activate JavaScript". Remove the hook. From version 23 follow the next steps.
3. Click away the settings window. Enter "about: config" in the Firefox address bar. Confirm the warning with "I'll be careful, I promise!"
4. Look for the entry "javascript.enabled". The "value" should be set to "True". To deactivate JavaScript, right-click on the setting name "javascript.enabled". In the context menu click on "Toggle". The value now changes to "False".

Testing was carried out under Firefox version 24. An add-on such as NoScript is more recommendable than completely deactivating JavaScript.

This practical tip shows you how to activate full-screen mode in Firefox.