This article describes what JavaScript® is, how to turn it on and off, what JavaScript® settings are available in Firefox and how to allow or block it on certain websites.

This article describes what JavaScript® is and how to allow or block it on certain websites.

Table of Contents

• 1 What is JavaScript?
• 2 Enable and disable JavaScript
• 3 Advanced JavaScript settings
• 4 Allow and block JavaScript on certain domains

Enable and disable JavaScript

In Firefox, you can configure whether JavaScript in web pages is permitted to execute or not. To allow JavaScript in Firefox:

1. At the top of the Firefox window, click on the Firefox button and then select OptionsAt the top of the Firefox window, click on the Tools menu and then select OptionsOn the menu bar, click on the Firefox menu and select Preferences...At the top of the Firefox window, click on the Edit menu and select Preferences

   Click the menu button and choose OptionsPreferences

2. In the OptionsPreferences window, select the Content panel.
   1. Enable JavaScript: Select this option to permit JavaScripts to execute on your computer.
   2. To change advanced settings, click Advanced….
      
      
      
      
      
      
      
      
3. Click OK to close the Options windowClick Close to close the Preferences windowClose the Preferences window

Advanced JavaScript settings

Through the Advanced JavaScript Settings window, you can configure the permissions for JavaScript.

• Move or resize existing windows: To prevent JavaScripts from changing the position or size of existing windows, deselect this option.
• Raise or lower windows: This option allows sites to place windows below or above existing windows.
• Disable or replace context menus: When you right-click an item, a sub-menu may appear. This menu, called a "context menu," can be disabled through JavaScripts. To prevent them from disabling context menus, deselect this option.

Based on information from JavaScript (mozillaZine KB)