All these pages have access to Chrome APIs. The popup and other pages An extension can include various HTML files, such as a popup, an options page, and other HTML pages. Content Scripts can only use a subset of the Chrome APIs but can indirectly access the rest by exchanging messages with the extension service worker. 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.
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