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Custom Style Script
Add Custom JavaScript (JS) Code or Styles (CSS) to any Page.
Firebug Lite for Opera 15+
与Firebug相同的外观，实时检查HTML，修改样式，强大的console功能，清爽版Firebug等你体验。
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
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
Octotree
GitHub code tree on steroids
SEO-tools
Font Inspector
Click on any HTML element to get the font info in a popup
RemoteDev DevTools
Use Redux DevTools in the DevTools
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
HTTP Headers
Quickly view the HTTP headers of the current tab.
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
JSON Finder
Browse JSON like you do it in Finder.
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
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!
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
CF-Predictor
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
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, ...
Web Sniffer
View all HTTP Requests and Responses sent between the Web browser and the Web server.
Luminous: JavaScript events blocker
An experimental extension to identify, analyze and block code execution and event collection through JavaScript in your browser.
Get Thumbnails or Image to video YouTube
從YouTube視頻製作縮略圖或圖像
Remove cookie(s) for the current domain
Remove cookie(s) for the current site with just one click
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
JavaScript QR Code
Make QR Codes in JavaScript
PageSpeed Insights
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
Web Developer Checklist
Analyses any web page for violations of best practices
AddJS
This extension allows you to add your own custom website specific JavaScript.
Flag & WHOIS SEO Domain Full Info
Return the domain's IP address , information about security, localization of server, ping, etc.