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In Firefox it is possible to add extra functionality to web applications with extensions such as Greasemonkey and Stylish. Opera also has this feature natively. Which of these types of scripts do you find the most useful?

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closed as primarily opinion-based by Alex, Al E., Eight Days of Malaise, John C, Vidar S. Ramdal Dec 15 '15 at 14:17

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.If this question can be reworded to fit the rules in the help center, please edit the question.

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Google Chrome also supports many Greasemonkey scripts by automatically converting them to extensions: blog.chromium.org/2010/02/40000-more-extensions.html – Greg Bray Jul 1 '10 at 5:05

Cookie Zapper can be useful for some sites, although it's lower-left status is annoying.

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There's a script published on meta that hides the FAQ popup that appears when you first visit a StackExchange site.

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