manifest.json

{
  "manifest_version": 2,
  "name": "React Developer Tools",
  "description": "Adds React debugging tools to the Chrome Developer Tools.",
  "version": "2.5.2",

  "minimum_chrome_version": "49",

  "icons": {
    "16": "icons/16-production.png",
    "32": "icons/32-production.png",
    "48": "icons/48-production.png",
    "128": "icons/128-production.png"
  },

  "browser_action": {
    "default_icon": {
      "16": "icons/16-disabled.png",
      "32": "icons/32-disabled.png",
      "48": "icons/48-disabled.png",
      "128": "icons/128-disabled.png"
    },

    "default_popup": "popups/disabled.html"
  },

  "devtools_page": "main.html",

  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "web_accessible_resources": [ "main.html", "panel.html", "build/backend.js"],

  "background": {
    "scripts": [ "build/background.js" ],
    "persistent": false
  },

  "permissions": [
    "file:///*",
    "http://*/*",
    "https://*/*"
  ],

  "content_scripts": [
    {
      "matches": ["<all_urls>"],
      "js": ["build/inject.js"],
      "run_at": "document_start"
    }
  ]
}