Examine source code of Handle

{
  "manifest_version": 3,
  "name": "Handle",
  "version": "0.1.0",
  "author": "Alireza Dastyar",
  "description": "Make a manual http request through browser for interactive response, mostly useful for posting html forms.",
  "homepage_url": "https://github.com/AlirezaDastyar/handle-extension",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "action": {
    "default_title": "Handle",
    "default_icon": "icons/icon-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "handle-ext@dastyar.space"
    }
  }
}