Examine source code of AOCPLD

{
  "manifest_version": 2,
  "name": "AOCPLD",
  "version": "1.0.2",
  "description": "Advent of Code Private Leaderboard Daily provides submission times for each participant for each problem.",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "*://adventofcode.com/2020/leaderboard/private/view/*.json"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://adventofcode.com/*/leaderboard/private/view/*"
      ],
      "js": [
        "dist/aocpld.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{81ec4b80-e3da-4144-8352-0b593666fb57}"
    }
  }
}