Examine source code of Technorino Extension

{
  "name": "Technorino Extension",
  "description": "Extension for Chatterino fork, Technorino",
  "version": "1.1.1",
  "permissions": [
    "tabs",
    "nativeMessaging"
  ],
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "manifest_version": 2,
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "browser_action": {
    "default_popup": "src/popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "technorino_native@technorino.com",
      "strict_min_version": "57.0"
    }
  }
}