How to Install JavaScript in Mozilla Firefox
JavaScript is a browser-based programming language that allows Web developers to add dynamic functionality and enhanced user-interface effects to Web pages using methods that standard HTML does not offer. Although JavaScript support is enabled by default in Firefox, some users opt to disable the feature to help prevent the occurrence of pop-up windows and distracting page effects. Because support for JavaScript is integrated into the source code of Firefox, you do not need to download or install additional software to re-enable it. Instead, you simply need to navigate to the proper settings menu.
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Instructions
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Open a Firefox browser window.
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Click the "Firefox" button at the top-left corner of the browser window and select "Options." (If you use Firefox version 3 or earlier, click the "Tools" button along the top of the window and select "Options" instead.)
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Select the "Content" tab located at the top of the resulting dialog box.
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Check the box next to the "Enable JavaScript" item.
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Click "OK" to confirm the change.
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