tabs.executeScript()

var executing = browser.tabs.executeScript(
  tabId,                 // optional integer
  details                // object
)

Parameters

tabId Optional

integer. The ID of the tab in which to run the script. Defaults to the active tab of the current window.

details

An object describing the script to run. It contains the following properties:

allFrames Optional

boolean. If true, the code will be injected into all frames of the current page. If true and frameId is set, then the code will be injected into the specified frame and all its child frames. If it is false, code is only injected into the top frame. Defaults to false.

code Optional

string. Code to inject, as a text string. Warning: Don’t use this property to interpolate untrusted data into JavaScript, as this could lead to a security issue.

file Optional

string. Path to a file containing the code to inject. In Firefox, relative URLs not starting at the extension root are resolved relative to the current page URL. In Chrome, these URLs are resolved relative to the extension's base URL. To work cross-browser, you can specify the path as a relative URL, starting at the extension's root, like this: "/path/to/script.js".

frameId Optional

integer. The frame where the code should be injected. Defaults to 0 (the top-level frame).

matchAboutBlank Optional

boolean. If true, the code will be injected into embedded "about:blank" and "about:srcdoc" frames if your extension has access to their parent document. The code cannot be inserted in top-level about: frames. Defaults to false.

runAt Optional

extensionTypes.RunAt. The soonest that the code will be injected into the tab. Defaults to "document_idle".

Return value

A Promise that will be fulfilled with an array of objects, representing the result of the script in every injected frame.

The result of the script is the last evaluated statement, which is similar to what would be output (the results, not any console.log() output) if you executed the script in the Web Console. For example, consider a script like this:

var foo='my result';foo;

Here the results array will contain the the string "my result" as an element. The result values must be structured clonable.

If any error occurs the promise will be rejected with an error message.

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

This example executes a one-line code snippet in the currently active tab:

function onExecuted(result) {
  console.log(`We made it green`);
}

function onError(error) {
  console.log(`Error: ${error}`);
}

var makeItGreen = 'document.body.style.border = "5px solid green"';

var executing = browser.tabs.executeScript({
  code: makeItGreen
});
executing.then(onExecuted, onError);

This example executes a script from a file, packaged with the extension, called "content-script.js". The script is executed in the currently active tab. The script is executed in subframes as well as the main document:

function onExecuted(result) {
  console.log(`We executed in all subframes`);
}

function onError(error) {
  console.log(`Error: ${error}`);
}

var executing = browser.tabs.executeScript({
  file: "/content-script.js",
  allFrames: true
});
executing.then(onExecuted, onError);

This example executes a script from a file, packaged with the extension, called "content-script.js". The script is executed in the tab with an ID of 2:

function onExecuted(result) {
  console.log(`We executed in tab 2`);
}

function onError(error) {
  console.log(`Error: ${error}`);
}

var executing = browser.tabs.executeScript(
  2, {
    file: "/content-script.js"
});
executing.then(onExecuted, onError);

Example extensions

• beastify
• context-menu-copy-link-with-types
• devtools-panels
• imagify
• menu-demo

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