Examine source code of Simple Tab Rotator

{
  "manifest_version": 2,
  "name": "Tab Rotator",
  "version": "1.1",
  "description": "Automatically rotates through open tabs every N seconds.",
  "permissions": [
    "tabs",
    "alarms",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/logo.png",
      "32": "icons/logo.png",
      "48": "icons/logo.png",
      "128": "icons/logo.png"
    }
  },
  "icons": {
    "16": "icons/logo.png",
    "32": "icons/logo.png",
    "48": "icons/logo.png",
    "128": "icons/logo.png"
  },
  "commands": {
    "rotate-next": {
      "suggested_key": {
        "default": "Alt+N"
      },
      "description": "Rotate to next tab"
    },
    "rotate-prev": {
      "suggested_key": {
        "default": "Alt+P"
      },
      "description": "Rotate to previous tab"
    },
    "toggle-pause": {
      "suggested_key": {
        "default": "Alt+Space"
      },
      "description": "Toggle rotation pause"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7082c974-e6ae-44cc-81ba-7a7de256f1dd}"
    }
  }
}