Examine source code of wuDict Hover

{
  "manifest_version": 3,
  "name": "wudict Hover",
  "version": "0.1.0",
  "description": "Show wudict dictionary definitions on hover, optionally behind a modifier key.",
  "browser_specific_settings": {
    "gecko": {
      "id": "wudict-hover@localhost",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background/main.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "wudict Hover",
    "default_popup": "action/action.html",
    "default_icon": {
      "16": "icons/on-16.png",
      "32": "icons/on-32.png",
      "48": "icons/on-48.png",
      "128": "icons/on-128.png"
    }
  },
  "icons": {
    "16": "icons/on-16.png",
    "32": "icons/on-32.png",
    "48": "icons/on-48.png",
    "128": "icons/on-128.png"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+W"
      },
      "description": "Open the wudict Hover panel"
    },
    "lookup-selection": {
      "suggested_key": {
        "default": "Alt+Shift+W"
      },
      "description": "Look up the selected text in wudict"
    },
    "toggle-enabled": {
      "description": "Pause or resume hover lookup everywhere"
    },
    "toggle-site": {
      "description": "Pause or resume hover lookup on this site"
    }
  },
  "permissions": [
    "storage",
    "contextMenus"
  ]
}