Usual: "*://*./" plus any other sites you want. Doesn't show a permission warning when installing the extension. The callback of this method receives results of the last expression in the content script so it can be used to extract data which must be JSON-compatible, see method 1 note above.īest case: "activeTab", suitable for a response to a user action (usually a click on the extension icon in the toolbar). Use to inject a content script on demand. After that happens, use messaging but note, it can't send DOM elements, Map, Set, ArrayBuffer, classes, functions, and so on - it can only send JSON-compatible simple objects and types so you'll need to manually extract the required data and pass it as a simple array or object.
Content scripts will execute in the tab as a part of that page, not as a part of the extension.
You need a content script to access DOM of web pages and interact with a tab's contents. ManifestV3 service worker doesn't have any DOM/document. Extension pages/scripts such as the browser_action popup or ManifestV2 background script have their own DOM, document, window, and a chrome-extension:// URL (use devtools for that part of the extension to inspect it).
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