Examine source code of Ambuli

{
  "manifest_version": 3,
  "name": "Ambuli",
  "description": "Ambuli - Launches Digital Dictionories of South Asia for the selected word",
  "version": "2.0",
  "icons": {
    "16": "logo/kavi_16.png",
    "48": "logo/kavi_48.png",
    "128": "logo/kavi_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1cda7d2e-d866-497a-9dad-41050ba53ebf}",
      "strict_min_version": "42.0"
    }
  },
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  }
}