Examine source code of Flow - Tab Manager

{
  "icons": {
    "16": "icon16.plasmo.87ddb62d.png",
    "32": "icon32.plasmo.38369f2b.png",
    "48": "icon48.plasmo.1958ffe0.png",
    "64": "icon64.plasmo.d4b75682.png",
    "128": "icon128.plasmo.2e986fa7.png"
  },
  "manifest_version": 3,
  "action": {
    "default_icon": {
      "16": "icon16.plasmo.87ddb62d.png",
      "32": "icon32.plasmo.38369f2b.png",
      "48": "icon48.plasmo.1958ffe0.png",
      "64": "icon64.plasmo.d4b75682.png",
      "128": "icon128.plasmo.2e986fa7.png"
    },
    "default_popup": "popup.html"
  },
  "version": "1.2.9",
  "author": "Mahdi Mallaee",
  "name": "Flow - Tab Manager",
  "description": "A new way to manage chrome tabs and windows easily.",
  "background": {
    "scripts": [
      "background.15923c44.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "tabGroups",
    "unlimitedStorage",
    "favicon",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@flow-tab-manager",
      "strict_min_version": "109.0"
    }
  },
  "optional_permissions": [
    "history",
    "downloads",
    "system.display"
  ]
}