Examine source code of Feed Shield for Facebook

{
  "manifest_version": 3,
  "name": "Feed Shield for Facebook",
  "version": "2.8.1",
  "description": "Take control of your feed. Locally hide ads and selected suggestions on Facebook Home. Not affiliated with or endorsed by Meta.",
  "icons": {
    "16": "icons/icon-16.png",
    "19": "icons/icon-19.png",
    "24": "icons/icon-24.png",
    "32": "icons/icon-32.png",
    "38": "icons/icon-38.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png",
    "256": "icons/icon-256.png",
    "512": "icons/icon-512.png"
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "service-worker.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-muted-16.png",
      "19": "icons/icon-muted-19.png",
      "24": "icons/icon-muted-24.png",
      "32": "icons/icon-muted-32.png",
      "38": "icons/icon-muted-38.png",
      "48": "icons/icon-muted-48.png",
      "128": "icons/icon-muted-128.png"
    },
    "default_popup": "popup.html",
    "default_title": "Feed Shield for Facebook"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.facebook.com/*"
      ],
      "js": [
        "filter-core-helpers.js",
        "filter-core.js",
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{55cd10d9-9f5d-41dd-8132-dc8800a1ca7a}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}