Examine source code of reddelstiltskin

{
  "manifest_version": 2,
  "name": "reddelstiltskin",
  "version": "0.1",
  "homepage_url": "https://github.com/mrudden/reddelstiltskin",
  "description": "Switches 'www.reddit.com' to 'old.reddit.com'. Simple and privacy-centered, will never be sold.",
  "icons": {
    "48": "icons/icon2.png",
    "96": "icons/icon2-96.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://www.reddit.com/*"
  ],
  "background": {
    "scripts": [
      "reddelstiltskin.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "48.0"
    }
  }
}