Examine source code of FB Filter

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "0.5.34",
  "default_locale": "pl",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "https://www.facebook.com/*",
    "https://web.facebook.com/*",
    "https://m.facebook.com/*",
    "https://messenger.com/*",
    "https://www.messenger.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.facebook.com/*",
        "https://web.facebook.com/*",
        "https://m.facebook.com/*",
        "https://messenger.com/*",
        "https://www.messenger.com/*"
      ],
      "js": [
        "src/core.js",
        "src/content.js"
      ],
      "css": [
        "src/content.css"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_title": "__MSG_extensionName__",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/icon-16.png",
      "32": "assets/icon-32.png",
      "48": "assets/icon-48.png",
      "128": "assets/icon-128.png"
    }
  },
  "icons": {
    "16": "assets/icon-16.png",
    "32": "assets/icon-32.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  },
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "fb-filter@local.extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}