Examine source code of Adrian's Course Capture

{
  "manifest_version": 2,
  "name": "Adrian's Course Capture",
  "version": "1.1.0",
  "description": "Capture and save text content from web pages while browsing. Perfect for taking notes from online courses, documentation, and articles.",
  "license": "GPL-3.0-or-later",
  "browser_specific_settings": {
    "gecko": {
      "id": "course-capture@adrianbrozek.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "commands": {
    "toggle-capture": {
      "suggested_key": {
        "default": "Ctrl+Shift+L",
        "mac": "Command+Shift+L"
      },
      "description": "Start/Stop course capture"
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "Adrian's Course Capture",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  }
}