The oil monkey plug-in is the script manager of the browser. Greasemonkey, GM for short, commonly known as "oil monkey" in Chinese, is an add-on component of MozillaFirefox. Let users install some scripts to make most HTML-based web pages change directly on the client more convenient and easy to use. Because the Greasemonkey script is resident in the browser, it will be automatically modified every time the destination page is opened, so that users who run the script can deeply enjoy its fixed convenience. Greasemonkey can add some new functions to a webpage, correct webpage errors, merge data from different webpages, or other functions that are too many to load. A well-written Greasemonkey script can even seamlessly integrate its output with the modified page, just like a part of the original web page.