Examine source code of Uglier Websites

{
  "manifest_version": 2,
  "name": "Uglier Websites",
  "version": "1.1",
  "homepage_url": "https://github.com/trustedtomato/uglier-websites",
  "description": "Makes given websites uglier.",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "options_ui": {
    "page": "options/index.html"
  },
  "permissions": [
    "storage",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "uglier-websites@trustedtomato.github.io",
      "strict_min_version": "59.0"
    }
  }
}