Examine source code of Excali Local

{
  "manifest_version": 3,
  "name": "Excali Local",
  "description": "__MSG_description__",
  "version": "1.6.4",
  "icons": {
    "16": "excali@16px.png",
    "48": "excali.png",
    "128": "excali@128px.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Excali Popup Menu",
    "default_popup": "popup.html"
  },
  "commands": {
    "open-local-editor": {
      "suggested_key": {
        "default": "Alt+L"
      },
      "description": "Open local editor"
    },
    "open-quick-editor": {
      "suggested_key": {
        "default": "Alt+Q"
      },
      "description": "Open quick editor"
    },
    "capture-visible-tab": {
      "suggested_key": {
        "default": "Alt+A"
      },
      "description": "Capture visible tab"
    },
    "capture-select-area": {
      "suggested_key": {
        "default": "Alt+S"
      },
      "description": "Capture select area"
    }
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "optional_host_permissions": [
    "file:///*.excalidraw"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ison@excali-local.top",
      "strict_min_version": "102.0"
    }
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*.excalidraw",
        "file:///*.excalidraw"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/excalidraw.js"
      ]
    }
  ]
}