Examine source code of Giving Duo

{
  "name": "Giving Duo",
  "version": "1.0.1",
  "permissions": [
    "https://forum.duolingo.com/comment/*",
    "https://forum-api.duolingo.com/comments/*/love",
    "tabs",
    "activeTab",
    "webRequest"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "manifest_version": 2
}