Examine source code of Metallum Search

{
  "manifest_version": 2,
  "name": "Metallum Search",
  "description": "Adds a new option on the context menu to search on Metal-Archives (band, album or artirst) for a selected term.",
  "version": "1.0",
  "permissions": [
    "menus"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{07ed2910-afae-40fe-98b3-a9c8b981b1ae}"
    }
  }
}