Examine source code of s3Direct

{
  "description": "Redirects s3Uris to correct s3 location (required google as default search engine",
  "manifest_version": 2,
  "name": "s3Direct",
  "version": "1.0",
  "homepage_url": "https://github.com/",
  "background": {
    "scripts": [
      "s3Direct.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ]
}