Must Have Essential Rated 5 out of 5 stars
Without NoScript the web is a dangerous place.
NoScript (and RequestPolicy) should be part of the default distribution of any web-browser that calls itself a user-agent as opposed to a third-party-agent diverting the user's computing resources for questionable purposes.
NoScript prevents Firefox from getting entangled in a deadly web of consumer-hostile code. It's your computer, you decide what runs on it. NoScript helps you getting back ownership of your computing resources.