Examine source code of Context Lookups

{
  "manifest_version": 3,
  "name": "Context Lookups",
  "description": "This extension adds configurable lookup options for the context menu of selected text.",
  "version": "5.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "context-lookups@alec-mitnik.com"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "24": "icon24.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "64": "icon64.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "24": "icon24.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "options_ui": {
    "page": "popup.html?page=true",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}