Examine source code of SuperTab

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "SuperTabs",
  "description": "SuperTabs allows you to list and search current open tabs and switch to them quickly.",
  "version": "0.0.3resigned1",
  "browser_action": {
    "default_icon": {
      "16": "assets/icon_16.png",
      "32": "assets/icon_32.png",
      "64": "assets/icon_64.png",
      "128": "assets/icon_128.png"
    },
    "default_popup": "popup.html",
    "default_title": "SuperTabs"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "search_tabs": {
      "suggested_key": {
        "default": "Ctrl+Shift+E",
        "mac": "Command+Shift+E"
      },
      "description": "Toggle Super Tabs",
      "global": true
    }
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd5148d6-3b4f-4fe5-8f52-f3cfa9a320fc}"
    }
  }
}