Examine source code of EasyFRS

{
  "manifest_version": 2,
  "name": "EasyFRS",
  "description": "Fast ITS course search and enrollment with saved-class monitoring, an academic dashboard, and Presensi tools.",
  "version": "2.0.5",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "alarms",
    "notifications",
    "*://portal.its.ac.id/*",
    "*://akademik.its.ac.id/*",
    "*://presensi.its.ac.id/*",
    "*://mia.its.ac.id/*"
  ],
  "web_accessible_resources": [
    "icon/128.png"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://akademik.its.ac.id/list_frs.php*"
      ],
      "js": [
        "content-scripts/easyfrs.js"
      ]
    },
    {
      "matches": [
        "*://mia.its.ac.id/rencana-studi/detail*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/mia.js"
      ]
    },
    {
      "matches": [
        "*://portal.its.ac.id/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/portal.css"
      ],
      "js": [
        "content-scripts/portal.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "easyfrs@akademik.its.ac.id"
    }
  }
}