Examine source code of Soundful Tabs

{
  "name": "Soundful Tabs",
  "description": "Allows the user to manage and organize their tabs that make sounds in a toolbar button",
  "manifest_version": 2,
  "version": "1.2resigned1",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/toolbar-icon.png",
    "default_title": "Soundful Tabs",
    "default_popup": "popup/all_tabs.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{082a4d8d-42f6-46b8-93a7-5d6aaec5e801}"
    }
  }
}