Examine source code of pencil.nu

{
  "manifest_version": 3,
  "name": "pencil.nu",
  "description": "Sharpens Paper.nu and CAESAR with inline CTECs, seat counts, and faster term navigation.",
  "version": "0.9.5",
  "icons": {
    "16": "assets/icons/pencil-16.png",
    "32": "assets/icons/pencil-32.png",
    "48": "assets/icons/pencil-48.png",
    "128": "assets/icons/pencil-128.png"
  },
  "action": {
    "default_title": "pencil.nu",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/icons/pencil-16.png",
      "32": "assets/icons/pencil-32.png",
      "48": "assets/icons/pencil-48.png",
      "128": "assets/icons/pencil-128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://caesar.ent.northwestern.edu/*"
      ],
      "js": [
        "content/index.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.paper.nu/*"
      ],
      "js": [
        "content/index.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "https://caesar.ent.northwestern.edu/*",
    "https://www.paper.nu/*",
    "https://northwestern.bluera.com/*",
    "https://prd-nusso.it.northwestern.edu/*",
    "https://fed.it.northwestern.edu/*",
    "https://api-legacy.dilanxd.com/*",
    "https://cdn.dil.sh/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/fonts/*.woff2"
      ],
      "matches": [
        "https://caesar.ent.northwestern.edu/*",
        "https://www.paper.nu/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pencil@local.dev",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}