Examine source code of DEVNight

{
  "description": "Turn on Experimental Night Mode on dev.to and calm your eyes",
  "manifest_version": 2,
  "name": "DEVNight",
  "version": "1.1resigned1",
  "homepage_url": "https://github.com/bauripalash/devnight",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.dev.to/*"
      ],
      "js": [
        "devnight.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{12e9a3d4-dd07-4bd4-bd22-dd00756bba09}"
    }
  }
}