Examine source code of Dictionary Look Up

{
  "name": "Dictionary Look Up",
  "version": "2.15.0",
  "description": "Extension to look up words painlessly",
  "manifest_version": 3,
  "author": "Nguyen Trung Duc",
  "homepage_url": "https://github.com/ngntrgduc/Dictionary-Look-Up",
  "icons": {
    "16": "assets/icon16.png",
    "32": "assets/icon32.png",
    "128": "assets/icon128.png"
  },
  "action": {
    "default_popup": "index.html",
    "default_title": "Dictionary Look Up",
    "default_icon": "assets/icon.png"
  },
  "permissions": [
    "tabs"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+O"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ngntrgduc@DictionaryLookUp.com"
    }
  }
}