Examine source code of gradebook

{
  "manifest_version": 3,
  "name": "gradebook",
  "description": "Stay on top of your grades",
  "version": "2.0.3",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_title": "View Grades"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gradebook@ethandawes.dev"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.brightspace.com/d2l/lms/grades/my_grades/*"
      ],
      "css": [
        "content-scripts/brightspace.css"
      ],
      "js": [
        "content-scripts/brightspace.js"
      ]
    },
    {
      "matches": [
        "https://www.gradescope.com/courses/*"
      ],
      "css": [
        "content-scripts/gradescope.css"
      ],
      "js": [
        "content-scripts/gradescope.js"
      ]
    }
  ]
}