chromium/chrome/test/data/extensions/api_test/mime_handler_view/manifest.json

{
  // This extension's id is allowed to handle mime types.
  // chrome-extension://oickdpebdnfbgkcaoklfcdhjniefkcji
  "name": "Test MIMEHandlerView",
  "version": "1",
  "manifest_version": 2,
  "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDJ8Hl8K6R+n/hrPsN1ienxRU3GbL00wFHLJNML45MHwT+3PstgWf4EgC3wbyyTXFtbvJC+Hn14Hyltfhsa+cSraldNHeL+rl+FL04kE4uYHq8YhOYEtzUfg380+o7XV9oESKu9oLTeG9QuQCjmlp3MUqC9wm7ICjxR9flODClOkQIDAQAB",
  "mime_types": [
    "text/csv"
  ],
  "mime_types_handler": "index.html",
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "windows"
  ]
}