Examine source code of RefreshSmart

{
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "static/img/icon/icon19.png",
      "38": "static/img/icon/icon38.png"
    },
    "default_popup": "popup.html",
    "default_title": "__MSG_appDesc__"
  },
  "description": "__MSG_appDesc__",
  "icons": {
    "16": "static/img/icon/icon16.png",
    "48": "static/img/icon/icon48.png",
    "128": "static/img/icon/icon128.png"
  },
  "manifest_version": 2,
  "name": "Refresh Scheduler",
  "permissions": [
    "tabs",
    "contextMenus",
    "storage"
  ],
  "short_name": "__MSG_extensionName__",
  "version": "1.0.1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{cfe35748-05a7-4693-865a-8f332c5e45f4}"
    }
  }
}