Use this API to register user scripts, third-party scripts designed to manipulate webpages or provide new features. Registering a user script instructs the browser to attach the script to pages that match the URL patterns specified during registration.
This API offers similar capabilities to
contentScripts but with features suited to handling third-party scripts:
- execution is in an isolated sandbox: each user script is run in an isolated sandbox within the web content processes, preventing accidental or deliberate interference among scripts.
- access to the
documentglobal values related to the webpage the user script is attached to.
- no access to WebExtension APIs or associated permissions granted to the extension: the API script, which inherits the extension’s permissions, can provide packaged WebExtension APIs to registered user scripts. An API script is declared in the extension's manifest file using the "user_scripts" manifest key.
Warning: This API requires the presence of the
user_scripts key in the manifest.json, even if no API script is specified. For example.
Note: User scripts are unregistered when the related extension page (from which the user scripts were registered) is unloaded, so you should register a user script from an extension page that persists at least as long as you want the user scripts to stay registered.
- Registers user scripts.
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