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Octotree
GitHub on steroids
RemoteDev DevTools
Use Redux DevTools in the DevTools
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Font Inspector
Click on any HTML element to get the font info in a popup
SEO-tools
Picture in Play
Indicates whether the `picture` element is in use on a page.
ModHeader
Modify request and response headers
Firebug Lite for Opera 15+
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Web Mirrors
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, ...
AddJS
This extension allows you to add your own custom website specific JavaScript.
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
JSON Finder
Browse JSON like you do it in Finder.
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
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!
Web Sniffer
View all HTTP Requests and Responses sent between the Web browser and the Web server.
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
JavaScript QR Code
Make QR Codes in JavaScript
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
Luminous: JavaScript events blocker
An experimental extension to identify, analyze and block code execution and event collection through JavaScript in your browser.
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
fonts infos
An extention to show/inspect and analyze fonts in web-pages.
(X)HTML5 Checker
A small extension to validate the markup of current tab
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.