Examine source code of FF Session Importer

{
  "manifest_version": 2,
  "name": "FF Session Importer",
  "version": "1.0",
  "description": "Import Firefox sessionstore files and open tabs in new windows",
  "browser_specific_settings": {
    "gecko": {
      "id": "@ff-session-importer",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_title": "FF Session Importer",
    "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"
  },
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "privacy": {
    "description": "This extension does not collect any user data. All file processing happens locally in your browser.",
    "data_collection_permissions": "none"
  }
}