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BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Font Inspector
Click on any HTML element to get the font info in a popup
Octotree
GitHub code tree on steroids
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Modify Header Value
Add, modify or remove a header for any request on desired domains.
RemoteDev DevTools
Use Redux DevTools in the DevTools
SEO-tools
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
Luminous: JavaScript events blocker
An experimental extension to identify, analyze and block code execution and event collection through JavaScript in your browser.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
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!
CF-Predictor
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
Web Sniffer
View all HTTP Requests and Responses sent between the Web browser and the Web server.
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
JSON Finder
Browse JSON like you do it in Finder.
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, ...
Picture in Play
Indicates whether the `picture` element is in use on a page.
PageSpeed Insights
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
fonts infos
An extention to show/inspect and analyze fonts in web-pages.
Remove cookie(s) for the current domain
Remove cookie(s) for the current site with just one click
HTTP Headers
Quickly view the HTTP headers of the current tab.
Open in GIMP photo editor
Adds a context menu item to send images directly to GIMP photo editor
AMP Validator
Automatically checks each page for AMP validation.
Lorem Fill
A webpage form filler that populates context specific random test data into forms elements.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
Web Developer Checklist
Analyses any web page for violations of best practices
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