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.
Click on any HTML element to get the font info in a popup
This extension allows you to add your own custom website specific CSS style sheets.
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.
Remove cookie(s) for the current domain
Remove cookie(s) for the current site with just one click
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
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, ...
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
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
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
Corser - Authorize CORS requests
Cross-browser extension for authorizing cross-origin resource sharing (CORS) requests. This extension can be installed on browsers supporting the WebExtensions API (https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions) It intercepts all CORS requests and responses headers, and records/adds/changes their values so as to authorized unauthorized CORS requests. Use this extension only for testing purposes
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.