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Activate JavaScript in Firefox Browser

JavaScript controls in Firefox are located in the Tools / Options menu.
(see Tools / Options screenshot image below)

Once you see the Options menu, click on the Content tab.

Tick the "Enable JavaScript" checkbox.

Next, click on the Advanced button to the right on the same line, and you'll view other check boxes to control Firefox Advanced JavaScript setting values that will only allow certain script functions to occur per your personal preferences.

Check or uncheck the appropriate advanced JavaScript settings you want allowed in the Firefox browser and then click the OK button on the "Advanced JavaScript Settings" window box.. Click the OK button on the Options window..

Firefox browser has now been configured to allow JavaScript functionality to occur within the setting values you designated.

Please note that some other programs also may attempt to control whether JavaScript works or not. Personal security devices, firewall programs, etc. can allow or prevent JavaScript execution by the browser as well.

Note that Java and JavaScript are not the same thing. Although they can both be used within web page functions, the only common feature these 2 have with each other is the shared four characters "J a v a".

On a final note, JavaScript is a scripting language. Each browser (Internet Explorer, Firefox, Opera, Safari, WebTV, etc.) have their own JavaScript interpreter that take the JavaScript commands that are in a web page and executes the functions accordingly.