Examine source code of TODO List

{
  "manifest_version": 3,
  "name": "TODO List",
  "version": "1.0.0",
  "description": "A simple todo-list develop by Ashiqur Rahman Anik",
  "action": {
    "default_popup": "popup.html",
    "default_icon": "to-do-list.png"
  },
  "icons": {
    "16": "to-do-list.png",
    "32": "to-do-list.png",
    "48": "to-do-list.png",
    "128": "to-do-list.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ashiqur.anik25@gmail.com"
    }
  }
}