They can also read and modify the DOM of the pages they're injected into. Content scripts Content scripts execute Javascript in the context of a web page. It can use all the Chrome APIs, but it cannot interact directly with the content of web pages that’s the job of content scripts. There are many types of events, such as navigating to a new page, removing a bookmark, or closing a tab. The service worker The extension service worker handles and listens for browser events. The manifest records important metadata, defines resources, declares permissions, and identifies which files to run in the background and on the page. It also has to be located in the extension's root directory. The following are some of the most frequently used files: The manifest The extension's manifest is the only required file that must have a specific file name: manifest.json. # Extension filesĮxtensions contain different files, depending on the functionality provided.
See Extension development overview for a complete list of API capabilities. Allow users to collect and organize information across websites.Change the functionality or behavior of a website.The following are just a few examples of what extensions can do: What makes extensions more powerful than a web app is their access to Chrome APIs. # Chrome extension APIsĮxtensions can use all the JavaScript APIs that the browser provides. JavaScript is used for scripting and logic.īefore moving forward, we recommend that you become familiar with these technologies.HTML is used as a content markup language.# Web technologiesĮxtensions are written with the same web technologies used to create web applications: This page introduces Chrome extension development and provides links to step-by-step beginner tutorials. Chrome extensions enhance the browsing experience by adding features and functionality to the Chrome browser.
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