A browser extension is a software module for customizing a web browser. Browsers typically allow users to install a variety of extensions, including user interface modifications, cookie management, ad blocking, and the custom scripting and styling of web pages
Chrome extensions enhance the browsing experience by customizing the user interface, observing browser events, and modifying the web. Visit the Chrome Web Store for more examples of what extensions can do.
You can build extensions using the same web technologies that are used to create web applications: HTML, CSS, and JavaScript.
In addition to Web APIs, extensions also have access to Chrome Extension APIs to accomplish different tasks. For a more detailed overview, take a look at the Develop guide.
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