Examine source code of GummyGrab

{
  "manifest_version": 2,
  "name": "GummyGrab",
  "description": "Figma's screenshot sidekick. Capture screenshots in Chrome and bring them into Figma without pushing a single pixel.",
  "version": "1.2",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "downloads",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.min.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentscript.min.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+9",
        "mac": "MacCtrl+9"
      },
      "description": "Activate GummyGrab"
    }
  },
  "web_accessible_resources": [
    "css/bootstrap.min.css",
    "popup.min.js",
    "images/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{754499ca-e4e6-456a-b833-020005701f9f}"
    }
  }
}