Examine source code of StudMart Extension

{
  "manifest_version": 3,
  "name": "StudMart Extension",
  "version": "1.2",
  "description": "Кроссбраузерное расширение для отображения промокодов",
  "browser_specific_settings": {
    "gecko": {
      "id": "studmart_extension@studmart.org"
    }
  },
  "permissions": [
    "tabs"
  ],
  "host_permissions": [
    "http://studmart.ru/*",
    "https://studmart.ru/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "StudMart Extension",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*",
        "assets/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}