Расширения
Custom Style Script
Add Custom JavaScript (JS) Code or Styles (CSS) to any Page.
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
Disable Cookies
Disable cookies for current domain.
Firebug Lite for Opera 15+
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
SEO-tools
SEO-tools - информация о доменах, аудит сайтов на SEO ошибки, а также технический аудит любой страницы. Свыше 100 онлайн сервисов
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Font Inspector
Click on any HTML element to get the font info in a popup
RemoteDev DevTools
Use Redux DevTools in the DevTools
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
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!
HTTP Headers
Quickly view the HTTP headers of the current tab.
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.
JSON Finder
Browse JSON like you do it in Finder.
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
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, ...
Flag & WHOIS SEO Domain Full Info
Return the domain's IP address , information about security, localization of server, ping, etc.
PageSpeed Insights
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
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.
Web Developer Checklist
Analyses any web page for violations of best practices
Get Thumbnails or Image to video YouTube
Быстро получить превьюшку или картинку к видео с YouTube
Remove cookie(s) for the current domain
Remove cookie(s) for the current site with just one click
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
AddJS
This extension allows you to add your own custom website specific JavaScript.
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
Picture in Play
Indicates whether the `picture` element is in use on a page.
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