Examine source code of ShadowRouter Extension

{
  "manifest_version": 2,
  "name": "Shadow Router - Proxy Chain",
  "version": "0.1.2",
  "description": "Even if you have 'nothing to hide' You still want your privacy!",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "activeTab",
    "proxy",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}