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Open the “Tools” menu.
Select “Options…”, to open the Options dialog box.
In the row of coloured icons at the top, click “Content”.
Click the check box to the left of “Enable JavaScript” so that a tick appears. (Click again to remove the tick if you want to disable JavaScript.)
Click “OK” to close the Options dialog box.

If you are using Mac OS X, then you need to select Preferences… on the Firefox menu, instead of Options… on the Tools menu.

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