Examine source code of Send to Motrix

{
  "manifest_version": 2,
  "name": "Send to Motrix",
  "author": "dsymbol",
  "version": "1.0",
  "description": "Sends links to the Motrix download manager on demand",
  "homepage_url": "https://github.com/dsymbol/send-to-motrix",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "64": "icons/64.png",
    "128": "icons/128.png",
    "256": "icons/256.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png",
      "64": "icons/64.png",
      "128": "icons/128.png",
      "256": "icons/256.png"
    },
    "default_title": "Send to Motrix",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "menus",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{30754587-a0a4-4f81-a7f8-365202cfef38}"
    }
  }
}