Examine source code of Network+

{
  "manifest_version": 2,
  "name": "Network+",
  "version": "1.2.2",
  "description": "DevTools for network recording, editing and resending.",
  "icons": {
    "16": "img/icon_16.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  },
  "browser_action": {
    "default_icon": "img/icon.png",
    "default_title": "Network+"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "web_accessible_resources": [
    "js/inject.js"
  ],
  "permissions": [
    "*://*/*"
  ],
  "homepage_url": "https://clear.studio",
  "devtools_page": "devtools.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{d23e7f5e-c43b-4bcc-8bd4-b334dc3b5e1e}"
    }
  }
}