Examine source code of Vellaire.com Online

{
  "name": "Vellaire.com Online",
  "version": "1.1",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "icons": {
    "16": "./img/16.png",
    "48": "./img/48.png",
    "128": "./img/128.png"
  },
  "browser_action": {
    "default_popup": "./popup.html"
  },
  "permissions": [
    "https://vellaire.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{22fe9090-6374-4daf-9b3b-0ec9b46bca96}"
    }
  }
}