Examine source code of Pure Image Redirecter

{
  "manifest_version": 2,
  "name": "Pure Image Redirecter",
  "version": "1.0",
  "description": "Redirect image site pages directly to images",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://imgur.com/*",
    "https://i.imgur.com/*"
  ],
  "background": {
    "scripts": [
      "./build/background.js"
    ]
  },
  "icons": {
    "48": "icons/main-48.png",
    "96": "icons/main-96.png"
  }
}