Click on any HTML element to get the font info in a popup
Picture in Play
Indicates whether the `picture` element is in use on a page.
Use Redux DevTools in the DevTools
Responsive Web Design Tester
Responsive Web Design Tester is a quick and easy way to test your responsive website.
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Firebug Lite for Opera 15+
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 request and response headers
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.
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
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
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
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, ...
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
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
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu
A small extension to validate the markup of current tab
Quickly view the HTTP headers of the current tab.
A browser extension that brings a new GitHub experience
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
Custom menu allows the user to create a menu to access various network resources.