chromium/ui/file_manager/integration_tests/file_manager_test_manifest.json

{
  // chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/
  "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDBjsTE4ocXJWzgcCDCUcsPASoRCGaTHrHn6b4zDTCayTuJtyGKzw4xZPMiG4dbEbmSAwEU7UCoyJAM1XfLS7UQ/Zz7ft8wpZkSS8/PJW+E4Qu++tMS0csj2Wdrrd2c5yyWxlJ+H9o2ivwtwuxs7pd+LXt+gsBA0epnT04T9EvOTQIDAQAB",
  "name": "Files test extension",
  "version": "0.1",
  "incognito": "split",  // Run a separate instance for the incognito mode.
  "manifest_version": 2,
  "description": "Files test extension",
  "background": {
    "page": "file_manager/background.html"
  },
  "permissions": [
    {"fileSystem": ["write"]},
    "chrome://resources/",
    "tabs",
    "commandLinePrivate",
    "chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/*"
  ],
  "content_security_policy": "script-src 'self' chrome://resources ;"
}