Examine source code of Odoo Confirm

{
  "name": "Odoo Confirm",
  "description": "Asks you to confirm before sending a message in Odoo.",
  "version": "1.3.5",
  "manifest_version": 3,
  "action": {
    "default_icon": "icon.png"
  },
  "icons": {
    "16": "icon.png",
    "32": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/odoo*"
      ],
      "js": [
        "storage.js",
        "domain-filter.js",
        "domain-checker.js"
      ],
      "run_at": "document_start"
    },
    {
      "world": "MAIN",
      "matches": [
        "https://*/odoo*"
      ],
      "js": [
        "lib/18.0.js",
        "lib/saas-18.2.js",
        "lib/saas-18.4.js",
        "lib/19.0.js",
        "lib/saas-19.2.js",
        "lib/saas-19.3.js",
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "odoo-confirm@example.com"
    }
  }
}