Browser Extensions for QA Testers

A curated collection of browser extensions that enhance the QA testing workflow. These tools help testers inspect code, validate UI, debug APIs, simulate user behavior, measure performance, and ensure accessibility compliance - directly within the browser. Ideal for both manual and automation testers looking to streamline their web testing process.

• Table of Contents
  • Browser Extensions for QA Testers
    • Developer Tools
    • Testing Utilities
    • Pixel-Perfect & UI Testing
    • Accessibility Testing
    • Performance & SEO
    • Miscellaneous Tools

Developer Tools

• Chrome DevTools – Inspect HTML/CSS, monitor network traffic, debug JavaScript, and more.
• Web Developer – Adds a toolbar with tools for inspecting, disabling, and manipulating page elements.
• Window Resizer – Quickly test responsive designs on different screen sizes.
• EditThisCookie – Edit, add, delete, search, protect and block cookies easily.
• JSON Viewer – Beautifies JSON in the browser, useful for API testing.

Testing Utilities

• Postman Interceptor – Intercepts requests and responses from your browser to Postman.
• ModHeader – Modify HTTP request and response headers easily. Useful for testing environments or redirects.
• RESTED – Lightweight REST client for quick API testing.
• XPath Helper – Finds and tests XPath expressions directly in the browser.
• Form Filler – Auto-fills forms with dummy data, useful during repetitive testing.

Pixel-Perfect & UI Testing

• PixelPerfect – Overlay a design image on top of your site to ensure pixel-level alignment with the mockup.
• PerfectPixel by WellDoneCode – Overlay semi-transparent images over your HTML to match designs.
• Page Ruler Redux – Measure elements and distances in pixels on the screen.
• Visual Inspector – Edit and inspect live web pages visually without code.
• CSS Peeper – View CSS properties in a more visual, user-friendly way for UI inspection.

Accessibility Testing

• axe DevTools – Industry-standard accessibility testing tool powered by Deque.
• WAVE – Visualizes accessibility issues directly on the page.
• Accessibility Insights – Accessibility testing and guidance by Microsoft.

Performance & SEO

• Lighthouse – Built-in Chrome extension for testing performance, SEO, accessibility, and PWA.
• Web Vitals – Measures essential web vitals like LCP, FID, and CLS in real time.

Miscellaneous Tools

• User-Agent Switcher – Emulate different devices, operating systems, or browsers by changing the user agent string.
• ColorZilla – Eyedropper and color picker tool for UI testing.
• WhatFont – Easily identify fonts used on any webpage.
• Site Palette – Generate color palettes from any website.
• Ghostery – Check third-party scripts and trackers loaded on the site.

Contributing

Contributions are welcome! If you have suggestions for improvements or new use cases, feel free to open an issue or submit a pull request.