Examine source code of Reddit Oldify

{
  "manifest_version": 2,
  "name": "Reddit Oldify",
  "version": "1.0",
  "description": "Redirects Reddit links to old.reddit.com",
  "author": "HekimaLab",
  "icons": {
    "48": "logo-48.png",
    "96": "logo-96.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://www.reddit.com/*",
    "*://reddit.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{608b9ce4-d0b0-4336-954a-054e9b420e77}"
    }
  }
}