Examine source code of K12 Enhancer

{
  "manifest_version": 2,
  "name": "K12 Enhancer by TechPro Services",
  "short_name": "K12 Enhancer",
  "description": "K12 Enhancer applies a green gradient to NewRow and allows you to chat with your classmates in school discussions in near-realtime.",
  "version": "1.6.0",
  "author": "TechPro Services <phineasm4065@utahvirtual.org>",
  "homepage_url": "https://techpro-services.github.io/",
  "icons": {
    "1280": "img/K12 Enhancer.png"
  },
  "browser_action": {
    "default_icon": "img/K12 Enhancer.png",
    "default_title": "K12 Enhancer",
    "default_popup": "popup/index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://learning.k12.com/*"
      ],
      "js": [
        "dn/dn.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://learning.k12.com/*",
        "https://login-learn.k12.com/*"
      ],
      "js": [
        "K12/K12.js"
      ],
      "all_frames": true
    },
    {
      "matches": [
        "https://learning.k12.com/d2l/le/*/discussions/threads/*"
      ],
      "js": [
        "dc/inject.js",
        "dc/chat.js"
      ],
      "css": [
        "dc/main.css"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://smart.newrow.com/*",
        "https://www.newrow.com/"
      ],
      "js": [
        "newrow/newrow.js"
      ],
      "all_frames": true
    }
  ],
  "permissions": [
    "webRequest",
    "storage"
  ]
}