Layout Pest

Name: Layout Pest
Rating: 5 (1 reviews)
Author: Martin Sherwood

A Chrome extension that helps you visualize and debug layouts by adding outlines to elements.

As of June 2026, Layout Pest has 46 users and a 5.00/5 rating from 1 reviews in the Developer Tools category.

Martin Sherwood Developer Tools

Chrome Web Store ↗.crx

Users0%

Rating0%

5.00

1 reviews

Reviews0%

Version

1.1

Manifest V3

History

2 snapshots

Tracking since Apr 20, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 20, 2026	46	5.00	1	1.1
May 11, 2026	51	5.00	1	1.1
Now	46	5.00	1	1.1

Permissions & access

Permissions: activeTabscriptingcontextMenusstorage
Host access: None declared

Screenshots

About

Layout Pest is a useful tool for web developers and designers that helps visualize and debug page layouts by adding colorful outlines to all HTML elements. This extension is inspired by the popular Pesticide extension.

Key Features:
• Instantly toggle colored outlines around all HTML elements on any webpage
• Interactive hover effects that highlight specific elements you're examining
• Detailed tooltip showing element information including:
  - Element tag, ID, and classes
  - Exact dimensions and position
  - Margin, padding, and border values
  - Z-index and display properties
  - Complete CSS selector path
• Customizable outline thickness (1-5px)
• Badge indicator shows when the extension is active
• Zero impact on page performance when disabled

Perfect for:
• Frontend developers debugging layout issues
• Web designers checking element spacing and alignment
• CSS troubleshooting and development
• Teaching and learning about HTML structure
• Responsive design testing

Layout Pest is lightweight and easy to use. Simply click the extension icon to toggle outlines on any webpage, or use the context menu for additional options.

Privacy Note: Layout Pest operates entirely within your browser and doesn't collect any data or require any special permissions beyond what's needed to function.