Greasemonkey is a Mozilla Firefox extension that allows users to install scripts that make on-the-fly changes to HTML web page content on the DOMContentLoaded event, which happens immediately after it is loaded in the browser (also known as augmented browsing). The customization of an Internet browser often involves the use of third-party extensions designed to add new functionality or extend existing features. One of the browser that pioneered this type of add-ons is Mozilla Firefox which has a huge number of extensions written especially for it.
As Greasemonkey scripts are persistent, the changes made to the web pages are executed every time the page is opened, making them effectively permanent for the user running the script. With the help of this extension, anyone can enhance their preferred websites and enjoy a completely new level of practicality. Individualized scripts make it possible to tinker with each webpage you visit often and Greasemonkey balances everything, allowing users to keep track of installed scripts and customize their settings.
Greasemonkey can be used for adding new functions to web pages (for example, embedding price comparisons within shopping sites), fixing rendering bugs, combining data from multiple webpages, and numerous other purposes.
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