tabs.executeScript()

Injects JavaScript code into a page.

Note: When using Manifest V3 or higher, use scripting.executeScript() to execute scripts.

You can inject code into pages whose URL can be expressed using a match pattern. To do so, its scheme must be one of: http, https, or file.

You must have the permission for the page's URL—either explicitly, as a host permission—or, via the activeTab permission. Note that some special pages do not allow this permission, including reader view, view-source, and PDF viewer pages.

You can also inject code into pages packaged with your own extension:

You don't need any special permissions to do this.

You cannot inject code into any of the browser's built-in pages, such as: about:debugging, about:addons, or the page that opens when you open a new empty tab.

The scripts you inject are called content scripts.

This is an asynchronous function that returns a Promise.