In Firefox for Windows, from the Tools menu, select Options. If the menu bar is hidden, press Alt to make it visible. In Firefox for Mac OS X, from the Firefox menu, select Preferences. Click the Content tab. Check or uncheck Enable JavaScript. To enable or disable Java in Firefox 3.6 or later: In Firefox, from the Tools menu, select Add-ons. Support for Java with Firefox ended with Firefox version 51. If your version of Firefox is newer than version 51, you will need to use another browser, such as Internet Explorer or Safari. If your version of Firefox is 51 or older, Java can be enabled to run with it.

JavaScript is a scripting language used to create dynamic pages using client side as well as server side scripting. Enabling JavaScript in the web browsers is mandatory for most of the sites to run properly. For example, you need to enable JavaScript in order to disable any ads like in your browser. Here is the detailed explanation of enabling or disabling JavaScript in famous browsers like Google Chrome, Mozilla Firefox, Apple iOS Safari for iPhone and iPad, Apple Mac Safari and Internet Explorer. Disable JavaScript in Firefox • Toggle it again to enable JavaScript. Internet Explorer (Version 8 or above) • Open Internet Explorer and go to “Internet Options” available under “Tools” menu.

• Select “Security” tab and click on “Internet” zone. • If your security settings are set as “Default level” then JavaScript is already enabled in your browser. • Otherwise click on “Custom level” button and new window will open for changing your browser’s security settings. • Choose enable or disable button for “Active Scripting” option available under “Scripting” section.

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