Examine source code of Insert Date and Time

{
  "manifest_version": 2,
  "name": "Insert Date and Time",
  "author": "Francis Cottrell-Eshaghi",
  "homepage_url": "https://github.com/franciscottrell/insert-date-and-time",
  "version": "1.0",
  "description": "Inserts the current date and time into text fields with a context menu option.",
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png"
  },
  "license": "GPL-3.0-or-later",
  "browser_specific_settings": {
    "gecko": {
      "id": "{3e52ab61-d811-44b9-839a-656a46b0dd16}"
    }
  }
}