Examine source code of ZenLite AutoLister

{
  "manifest_version": 3,
  "name": "ZenLite AutoLister",
  "version": "0.0.4",
  "description": "Scrapes vehicle details from dealer websites and auto-fills Facebook Marketplace listing fields.",
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "helpers/api.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  },
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "helpers/special_cases.js",
        "universal_dealer.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "*://*.facebook.com/marketplace/create/*",
        "*://*.facebook.com/marketplace/you/listings*"
      ],
      "js": [
        "helpers/waitForElement.js",
        "helpers/uploadImages.js",
        "facebook.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icon.png",
        "banner.png",
        "rules.json"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "thezenliteproservice@gmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}