Examine source code of Easytorrent

{
  "manifest_version": 2,
  "name": "Easytorrent",
  "description": "Ajout de torrent via le click droit dans Firefox https://easy-tk.biz",
  "version": "2.4",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/border-48.png",
    "96": "icons/border-96.png",
    "128": "icons/border-128.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "contextMenus",
    "notifications",
    "storage",
    "menus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{585e48fb-773e-4918-bca5-386091378dc7}"
    }
  }
}