Note
This example taken from mdn/webextensions-examples, and is licensed under the Mozilla Public License, v. 2.0.
This add-on injects JavaScript into web pages. The addons.mozilla.org domain disallows this operation, so this add-on will not work properly when it's run on pages in the addons.mozilla.org domain.
This extension includes:
- a content script, "content-script.js", that is injected into all pages
- a background script, "background-script.js"
The content script listens for clicks in the page it's attached to. If a click is on a link, the content script sends the link's href to the background script.
The background script listens for this message. When the background script receives the message, it displays a notification containing the href.
The notification's content, as well as the extension's name and description, are localized into German, Dutch, and Japanese, as well as the default en-US.
- how to inject content scripts declaratively using manifest.json
- how to send messages from a content script to a background script
- how to display system notifications using the notifications API
- how to use the internationalization (i18n) system
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