Examine source code of KOTDAid

{
  "description": "An aid for KOTD. Displays maximum boss damage and maximum gold yield, based on community generated formulas.",
  "manifest_version": 2,
  "name": "KOTDAid",
  "version": "2.0",
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/door-16.png",
      "32": "icons/door-32.png"
    },
    "default_title": "KOTDAid",
    "default_popup": "popup/KOTDAid.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@KOTDAid2",
      "strict_min_version": "57.0a1"
    }
  }
}