Examine source code of Session Snapshot

{
  "manifest_version": 2,
  "name": "Session Snapshot",
  "version": "1.0",
  "description": "Take snapshots of your current tab session for easy restoration or sharing.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9444060f-9766-4131-97d8-89cc7e169a9e}"
    }
  }
}