Examine source code of Tab Session Saver

{
  "manifest_version": 2,
  "name": "Tab Session Saver",
  "version": "1.0",
  "description": "Save your current browsing session and restore it later.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{699f4a09-bb90-4691-89ef-905508323cfa}"
    }
  }
}