Examine source code of GoodNewsOnly

{
  "manifest_version": 2,
  "name": "GoodNewsOnly",
  "description": "GoodNewsOnly",
  "background": {
    "page": "background.html"
  },
  "version": "1.0.1",
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "GoodNewsOnly",
    "default_icon": "48x48.png"
  },
  "icons": {
    "48": "48x48.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "<all_urls>"
      ],
      "css": [
        "content.styles.css"
      ],
      "js": [
        "content.bundle.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "content.styles.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "GoodNewsOnly@example.org",
      "strict_min_version": "57.0"
    }
  }
}