Examine source code of Proxy Dev Extension

{
  "manifest_version": 3,
  "name": "Proxy Dev Extension",
  "description": "Local development tools for Dynamics, Power Pages, and Salesforce proxying, routing, and login handoff.",
  "version": "1.1.0",
  "icons": {
    "16": "assets/icons/icon16.png",
    "32": "assets/icons/icon32.png",
    "48": "assets/icons/icon48.png",
    "128": "assets/icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "proxy-dev-extension@resconet.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "host_permissions": [
    "*://*.dynamics.com/*",
    "*://*.powerappsportals.com/*",
    "*://*.force.com/*",
    "http://dynamics/*",
    "http://localhost/*",
    "https://localhost/*"
  ],
  "permissions": [
    "storage",
    "unlimitedStorage",
    "proxy",
    "cookies",
    "tabs",
    "webRequest",
    "webRequestBlocking"
  ],
  "action": {
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "32": "assets/icons/icon32.png",
      "48": "assets/icons/icon48.png",
      "128": "assets/icons/icon128.png"
    },
    "default_title": "Proxy Dev Extension",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "devtools_page": "devtools.html",
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  }
}