Examine source code of MoodGraph

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.0",
  "description": "__MSG_extensionDescription__",
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@2x.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8e207958-6609-4eb8-8919-cf504af7fa5a}"
    }
  }
}