Examine source code of Google Sheets Screenshot

{
  "manifest_version": 3,
  "name": "Sheets Screenshot",
  "version": "2.0",
  "description": "Capture screenshots of Google Sheets including scroll capture",
  "permissions": [
    "activeTab",
    "scripting",
    "downloads",
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "https://docs.google.com/*",
    "<all_urls>"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sheets-screenshot@42nadodaryll",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "commands": {
    "capture-screenshot": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description": "Screenshot: capture the visible area"
    },
    "capture-area": {
      "suggested_key": {
        "default": "Alt+Shift+A"
      },
      "description": "Area Screenshot: drag to select a region"
    },
    "capture-tall": {
      "suggested_key": {
        "default": "Alt+Shift+T"
      },
      "description": "Scroll Capture: capture the full sheet"
    },
    "capture-selection": {
      "suggested_key": {
        "default": "Alt+Shift+C"
      },
      "description": "Capture Selection: capture the selected cell range"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://docs.google.com/spreadsheets/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "preview.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}