Google Chrome Extensions are small programs that modify the Google Chrome

Google Chrome

Google Chrome is a web browser developed by Google that uses the WebKit layout engine. It was first released as a beta version for Microsoft Windows on September 2, 2008, and the public stable release was on December 11, 2008. The name is derived from the graphical user interface frame, or...

 browser. These extensions are written using web technologies like HTML

HTML

HyperText Markup Language is the predominant markup language for web pages. HTML elements are the basic building-blocks of webpages....

, JavaScript

JavaScript

JavaScript is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. It is a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles....

, and CSS

CSS

-Computing:*Cascading Style Sheets, a language used to describe the style of document presentations in web development*Central Structure Store in the PHIGS 3D API*Closed source software, software that is not distributed with source code...

. Google Chrome Extensions are downloadable through the Google Chrome Extensions Gallery. So far, over 2,200 extensions have been published by developers. All users with a Google Account

Google Account

A Google Account is a user account that provides access to Google-owned services such as Blogger, YouTube, and Google Groups. A Google Account can be identified either by the username or by their unique permanent ID...

are able to add extensions after developing them.