Examine source code of Paste Queue

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{833925a8-c29c-41fd-a1c7-024bae7a3579}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "name": "Paste Queue",
  "version": "1.4.0",
  "description": "Paste or replace text sequentially from a saved list.",
  "permissions": [
    "storage",
    "contextMenus",
    "activeTab",
    "contextualIdentities",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}