Examine source code of Quick moodboards

{
  "manifest_version": 2,
  "name": "Quick moodboards",
  "description": "Make moodboards quickly by collecting images through the browser contextual menu",
  "author": "Carmela Fores, Carles Escrig <esroyo@gmail.com>",
  "version": "0.3.6",
  "browser_specific_settings": {
    "gecko": {
      "id": "moodboards-addon@comparteix.net",
      "strict_min_version": "63.0"
    }
  },
  "icons": {
    "16": "assets/img/moodboard-16.png",
    "32": "assets/img/moodboard-32.png",
    "64": "assets/img/moodboard-64.png"
  },
  "background": {
    "scripts": [
      "vendor/webextension-polyfill/dist/browser-polyfill.min.js",
      "src/background/browser_action.js",
      "src/background/menus.js",
      "src/background/storage.js",
      "src/background/index.js"
    ]
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';",
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "*://*/*"
      ],
      "js": [
        "vendor/webextension-polyfill/dist/browser-polyfill.min.js",
        "src/content/index.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_icon": {
      "32": "assets/img/moodboard-32.png",
      "64": "assets/img/moodboard-64.png"
    },
    "default_title": "Quick moodboards"
  },
  "permissions": [
    "*://*/*",
    "downloads",
    "contextMenus",
    "tabs",
    "storage"
  ]
}