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Disable Cookies
Disable cookies for current domain.
SEO-tools
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
JSON Finder
Browse JSON like you do it in Finder.
Font Inspector
Click on any HTML element to get the font info in a popup
Octotree
GitHub code tree on steroids
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
Firebug Lite for Opera 15+
Web Sniffer
View all HTTP Requests and Responses sent between the Web browser and the Web server.
HTTP Headers
Quickly view the HTTP headers of the current tab.
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!
RemoteDev DevTools
Use Redux DevTools in the DevTools
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
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, ...
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
Luminous: JavaScript events blocker
An experimental extension to identify, analyze and block code execution and event collection through JavaScript in your browser.
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
Picture in Play
Indicates whether the `picture` element is in use on a page.
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
Flag & WHOIS SEO Domain Full Info
Return the domain's IP address , information about security, localization of server, ping, etc.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
CF-Predictor
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
Remove cookie(s) for the current domain
Remove cookie(s) for the current site with just one click
(X)HTML5 Checker
A small extension to validate the markup of current tab
Open in GIMP photo editor
Adds a context menu item to send images directly to GIMP photo editor
PageSpeed Insights
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
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