Disable cookies for current domain.
Modify Header Value
Add, modify or remove a header for any request on desired domains.
PDF API HTML5
Firebug Lite for Opera 15+
Browse JSON like you do it in Finder.
Picture in Play
Indicates whether the `picture` element is in use on a page.
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
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!
View all HTTP Requests and Responses sent between the Web browser and the Web server.
This extension allows you to add your own custom website specific CSS style sheets.
Click on any HTML element to get the font info in a popup
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
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
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, ...
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
A browser extension that brings a new GitHub experience
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
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
Nextsense XML Signing Component
Signing XML document.
Quickly view the HTTP headers of the current tab.
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.