Examine source code of Timesheet Summary

{
  "author": "msg",
  "description": "Tool zeigt die im msg-Timesheet erfassten Zeiten aufsummiert je Buchungsknoten an.",
  "browser_action": {
    "default_icon": {
      "48": "icon.png"
    },
    "default_title": "Timesheet Summary",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "manifest_version": 2,
  "name": "Timesheet Summary",
  "permissions": [
    "*://timesheet.msg.de/*"
  ],
  "version": "0.5resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0ce3e022-8536-4959-9a5b-c7d508696922}"
    }
  }
}