Examine source code of Redux DevTools

{
  "version": "3.2.10",
  "name": "Redux DevTools",
  "manifest_version": 3,
  "description": "Redux Developer Tools for debugging application state changes.",
  "homepage_url": "https://github.com/reduxjs/redux-devtools",
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@redux.devtools"
    }
  },
  "action": {
    "default_icon": "img/logo/38x38.png",
    "default_title": "Redux DevTools",
    "default_popup": "devpanel.html#popup"
  },
  "commands": {
    "devtools-window": {
      "description": "DevTools window"
    },
    "devtools-remote": {
      "description": "Remote DevTools"
    }
  },
  "icons": {
    "16": "img/logo/16x16.png",
    "48": "img/logo/48x48.png",
    "128": "img/logo/128x128.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.bundle.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "page.bundle.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "world": "MAIN"
    }
  ],
  "devtools_page": "devtools.html",
  "permissions": [
    "notifications",
    "contextMenus",
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "file:///*",
    "http://*/*",
    "https://*/*"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; img-src 'self' data:;"
  }
}