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Showing content from https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/user_scripts below:

user_scripts - Mozilla | MDN

Warning: This key is used by the legacy userScripts API, which is available to extensions using Manifest V2. This key is not required for the version of the userScripts API available for use with Manifest V3.

  "user_scripts": {
    "api_script": "apiscript.js",
  }

Instructs the browser to load a script packaged in the extension, known as the API script, this script is used to export a set of custom API methods for use in user scripts. The API script path, relative to the manifest.json file, is defined as a string in "api_script".

Note: The user_script key is required for the userScripts API to function, even if no API script is specified. For example. user_scripts: {}.

The API script:

• runs in the content processes.
• has access to the window and document globals related to the webpage it is attached to.
• has access to the same subset of WebExtension APIs usually available in a content script.

The script executes automatically on any webpage defined in matches by userScripts.register(). However, this is before the user script sandbox object is created and the custom API methods can be exported.

To export the custom API methods, the script listens for userScripts.onBeforeScript and then export the custom API methods.

Not every user script may need to consume all of the custom API methods. You can, therefore, include details of the APIs needed in scriptMetadata when running userScripts.register(). The API script then accesses the scriptMetadata through the script parameter received by the userScripts.onBeforeScript listener (as script.metadata).

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