extensions/test/data/system/memory/manifest.json

{
  "name": "system.memory test",
  "manifest_version": 2,
  "version": "1.0",
  "description": "Test system.memory API",
  "permissions": ["system.memory"],
  "app": {
    "background": {
      "scripts": ["test_memory_api.js"]
    }
  }
}