Examine source code of Privacy Hash Checker

{
  "manifest_version": 2,
  "name": "Privacy Hash Checker",
  "version": "2.3.3",
  "description": "Check file hashes with VirusTotal – Only hashes sent, no file uploads",
  "permissions": [
    "downloads",
    "storage",
    "notifications",
    "contextMenus",
    "https://www.virustotal.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Privacy Hash Checker",
    "default_icon": "icon.svg"
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1b46822f-ab4b-46d3-a53b-e8a8542ebfec}"
    }
  }
}