Examine source code of Tab Memory

{
  "manifest_version": 2,
  "name": "Tab Memory",
  "version": "1.0",
  "description": "Remember the original tab order after tabs are shuffled.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Tab Memory",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-memory@amo.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}