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NoScript (or NoScript Security Suite) is a free and open-source extension for Mozilla Firefox, SeaMonkey, and other Mozilla-based web browsers, created and actively maintained by Giorgio Maone, an Italian software developer and member of the Mozilla Security Group.
NoScript is a Firefox addon that can be used to prevent the running of scripts on the sites you visit. The addon automatically blocks all such content, but there may well be occasions when you need it to run.