Examine source code of downloadchibashi

{
  "manifest_version": 2,
  "name": "downloadchibashi",
  "version": "0.0.6resigned1",
  "description": "Download from youtube, vimeo, soundcloud, facebook, etc",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png"
  },
  "browser_action": {
    "default_icon": "icons/icon-64.png",
    "default_title": "دانلود‌چی‌باشی"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@downloadchibashi"
    }
  }
}