Extensions
Octotree
GitHub code tree on steroids
Firebug Lite for Opera 15+
Font Inspector
Click on any HTML element to get the font info in a popup
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!
SEO-tools
Modify Header Value
Add, modify or remove a header for any request on desired domains.
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.
RemoteDev DevTools
Use Redux DevTools in the DevTools
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
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
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
Get Thumbnails or Image to video YouTube
Faites une vignette ou des images à partir de vidéos YouTube
Web Sniffer
View all HTTP Requests and Responses sent between the Web browser and the Web server.
Remove cookie(s) for the current domain
Remove cookie(s) for the current site with just one click
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
WordPress Theme and Plugins Detector
Cet outil détecte les thèmes et les plugins utilisés sur les sites WordPress et affiche des informations à leur sujet.
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
PageSpeed Insights
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
JSON Finder
Browse JSON like you do it in Finder.
HTTP Headers
Quickly view the HTTP headers of the current tab.
CF-Predictor
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
NoFollow
Outlines nofollow links, detects nofollow and noindex meta tags on webpages. Features website filtering and custom CSS outline styles
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
Luminous: JavaScript events blocker
An experimental extension to identify, analyze and block code execution and event collection through JavaScript in your browser.
AddJS
This extension allows you to add your own custom website specific JavaScript.
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
Nextsense XML Signing Component
Signing XML document.
Picture in Play
Indicates whether the `picture` element is in use on a page.
fonts infos
An extention to show/inspect and analyze fonts in web-pages.
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