极速阅览

Syntax

js
let executeUserScript = browser.userScripts.execute(
  injection, // object
);

Parameters

injection

An object specifying what user scripts to inject, where, and how.

injectImmediately Optional

boolean. If set to true, the injection is triggered as soon as possible in the target context. This doesn't guarantee that the injection occurs before the page finishes loading, as the page may load before the script has reached the target.

array of userScripts.ScriptSource. The scripts to inject into matching pages.

target

An object that defines the target context scripts are injected into.

allFrames Optional

boolean. If set to true, the script is injected into all available frames. Defaults to false, in which the script is only injected into the top frame.

documentIds Optional

array of string. The IDs of the documents to inject into. Must not be specified if frameIds is set.

frameIds Optional

array of integer. The IDs of the frames to inject into. Must not be specified if documentIds is set.

tabId

integer. The ID of a tab to inject into.

world Optional

userScripts.ExecutionWorld. The execution environment to use to run the scripts. Defaults to "USER_SCRIPT".

worldId Optional

string. ID of a user script world the script executes in. Only valid if world is USER_SCRIPT or omitted. If worldId is omitted, the script is executed in the default USER_SCRIPT world (""). Values with leading underscores (_) are reserved. The maximum length is 256 characters. A world can be used by several scripts as their execution environment. To configure the behavior of a world, pass its worldId to userScripts.configureWorld before the first script executes in that world.

Return Value

A Promise fulfilled with an array of objects describing the outcome of the injection with these properties:

documentId

string. Document ID associated with the injection.

error Optional

string. Error message if any. This is mutually exclusive with result

frameId

integer. Frame ID associated with the injection.

result Optional

string. Result of the script injection if any. This is mutually exclusive with error

Examples

js
await browser.userScripts.execute({
  js: [{ code: "console.log('Hello world!');" }],
  target: { tabId: 1 },
});

Browser compatibility

Enable JavaScript to view this browser compatibility table.

Help improve MDN

Was this page helpful to you?

Yes No

Learn how to contribute

This page was last modified on May 6, 2026 by MDN contributors.

View this page on GitHub • Report a problem with this content

userScripts.execute()

In this article