Examine source code of Reddit Old Redirect

{
  "manifest_version": 2,
  "name": "Reddit Old Redirect",
  "version": "1.0",
  "description": "Redirects www.reddit.com to old.reddit.com",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://www.reddit.com/*"
  ],
  "developer": {
    "name": "Cédric Skwar",
    "url": "https://cedric.skwar.me"
  },
  "homepage_url": "https://git.foobar.vip/benni347/reddit-old-reddit-redirect",
  "author": "Cédric Skwar",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1b74ff1b-810d-43c6-9345-d7b8fe5f5c10}",
      "strict_min_version": "120.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}