Examine source code of todo-ms-connect

{
  "manifest_version": 2,
  "name": "MS ToDo Client",
  "version": "0.0.48",
  "description": "Unofficial Microsoft To Do client for web browsers",
  "$schema": "../schema/manifest.schema.json",
  "default_locale": "en",
  "icons": {
    "64": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "assets/main-38380a27.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "64": "icons/icon.png"
    },
    "default_title": "Add as link to list",
    "show_matches": [
      "*://*/*"
    ]
  },
  "permissions": [
    "contextMenus",
    "identity",
    "storage",
    "notifications",
    "webRequest",
    "tabs",
    "webRequestBlocking",
    "webNavigation",
    "<all_urls>",
    "https://ext.mstodo.connect/",
    "https://login.live.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "todomsconnect@edu.pl"
    }
  },
  "web_accessible_resources": [
    "tasklist/tasklist.html"
  ]
}