Examine source code of Session Switcher 2

{
  "manifest_version": 3,
  "name": "Session Switcher 2",
  "version": "1.9.2",
  "description": "Manage multiple accounts on the same site. Local-first, keyboard-first, no telemetry.",
  "permissions": [
    "storage",
    "tabs",
    "cookies",
    "activeTab",
    "scripting",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "service_worker": "background/index.js",
    "scripts": [
      "background/index.js"
    ]
  },
  "action": {
    "default_popup": "popup/index.html",
    "default_title": "Session Switcher",
    "default_icon": {
      "16": "assets/icons/icon-16.png",
      "32": "assets/icons/icon-32.png",
      "48": "assets/icons/icon-48.png",
      "128": "assets/icons/icon-128.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Open Session Switcher popup"
    }
  },
  "icons": {
    "16": "assets/icons/icon-16.png",
    "32": "assets/icons/icon-32.png",
    "48": "assets/icons/icon-48.png",
    "128": "assets/icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "session-switcher-2@erzambayu",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}