Localhost Warning

Name: Localhost Warning
Rating: 5 (1 reviews)
Author: Ondřej Chlumecký

Displays a warning banner on local and development pages.

As of May 2026, Localhost Warning has 13 users and a 5.00/5 rating from 1 reviews in the Developer Tools category.

Ondřej Chlumecký Developer Tools

Chrome Web Store ↗.crx

Users−13.3%

Rating0%

5.00

1 reviews

Reviews0%

Version

2.0

Manifest V3

History

2 snapshots

Tracking since Apr 30, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 30, 2026	15	5.00	1	2.0
May 27, 2026	12	5.00	1	2.0
Now	13	5.00	1	2.0

Permissions & access

Permissions: activeTabstorage
Host access: None declared

Screenshots

About

This extension helps developers easily recognize when they are working in a local or development environment by displaying a clear warning banner at the top of the page.

🚀 Features:
✅ Detects localhost, 127.0.0.1, .docker, and dev. domains.
✅ Displays a red warning banner with “This is a local or development page!” message.
✅ Prevents accidental modifications or actions in non-production environments.
✅ Works automatically on all web pages without additional setup.

Perfect for developers, testers, and teams working with local or staging environments!

🔧 How to use:
	1.	Install the extension.
	2.	Open any local or development site (e.g., http://localhost, http://xxxx.docker, https://dev.xxxx).
	3.	See the warning banner at the top of the page.

⚠️ Note: This extension does not modify site functionality—it only adds a visual indicator to prevent mistakes.