Examine source code of Save Tabs - Browser Session Manager

{
  "manifest_version": 3,
  "version": "0.3.4",
  "name": "Save Tabs - Browser Session Manager",
  "description": "__MSG_description__",
  "default_locale": "en",
  "icons": {
    "16": "/data/icons/16.png",
    "19": "/data/icons/19.png",
    "32": "/data/icons/32.png",
    "38": "/data/icons/38.png",
    "48": "/data/icons/48.png",
    "64": "/data/icons/64.png",
    "128": "/data/icons/128.png",
    "256": "/data/icons/256.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "unlimitedStorage",
    "notifications",
    "contextMenus",
    "tabGroups",
    "downloads",
    "favicon"
  ],
  "optional_permissions": [
    "cookies"
  ],
  "background": {
    "service_worker": "worker.js",
    "scripts": [
      "safe.js",
      "worker.js"
    ]
  },
  "action": {
    "default_popup": "/data/popup/index.html"
  },
  "homepage_url": "https://add0n.com/save-tabs.html",
  "commands": {
    "_execute_action": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{08762c8b-d37d-4230-bfdb-a8477be47c34}",
      "strict_min_version": "139.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}