Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Responsive Web Design Tester
Responsive Web Design Tester is a quick and easy way to test your responsive website.
Custom Style Script
Picture in Play
Indicates whether the `picture` element is in use on a page.
Firebug Lite for Opera 15+
Use Redux DevTools in the DevTools
Modify request and response headers
Browserling - Cross-browser testing
Cross-browser test websites in the most popular browsers such as Internet Explorer, Edge, Chrome, Firefox, Safari and Opera. Try for free!
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
Live editor for CSS and LESS - Magic CSS
Live preview of CSS/LESS code with an in-page editor. Autocomplete, convert LESS to CSS, beautify, minify, CSS reloader, linter, ...
Browse JSON like you do it in Finder.
View all HTTP Requests and Responses sent between the Web browser and the Web server.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
An extention to show/inspect and analyze fonts in web-pages.
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Remove cookie(s) for the current domain
Remove cookie(s) for the current site with just one click
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
Quickly view the HTTP headers of the current tab.
This extension allows you to add your own custom website specific CSS style sheets.
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
A browser extension that brings a new GitHub experience
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
A small extension to validate the markup of current tab