Examine source code of UL scheduler

{
  "manifest_version": 3,
  "name": "UL scheduler",
  "version": "1.1.3.3",
  "description": "Create your schedule for University of Ljubljana.",
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ulscheduler@example.tini4",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "host_permissions": [
    "https://urnik.fri.uni-lj.si/*",
    "https://urniki.bf.uni-lj.si/*",
    "https://urnik.fmf.uni-lj.si/*",
    "https://www.wise-tt.com/wtt_fkkt/*",
    "https://urnik.fs.uni-lj.si/*"
  ],
  "permissions": [
    "tabs",
    "storage"
  ],
  "action": {
    "default_popup": "src/popup/index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://urnik.fri.uni-lj.si/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "src/content/fri.js"
      ],
      "css": [
        "src/content/fri.css"
      ]
    },
    {
      "matches": [
        "https://urniki.bf.uni-lj.si/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "src/content/bf.js"
      ]
    },
    {
      "matches": [
        "https://urnik.fmf.uni-lj.si/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "src/content/fmf.js"
      ]
    },
    {
      "matches": [
        "https://www.wise-tt.com/wtt_fkkt/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "src/content/fkkt.js"
      ],
      "css": [
        "src/content/fkkt.css"
      ]
    },
    {
      "matches": [
        "https://urnik.fs.uni-lj.si/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "src/content/fs.js"
      ]
    }
  ]
}