Leudachain
TeamCity Notifier
Shows notifications about various events in TeamCity
RESTED
A REST client for the rest of us
Font Inspector
Click on any HTML element to get the font info in a popup!
Picture in Play
Indicates whether the `picture` element is in use on a page.
SEO-tools
SEO-tools - информация о доменах, аудит сайтов на SEO ошибки, а также технический аудит любой страницы. Свыше 100 онлайн сервисов
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
Disable Cookies
Disable cookies for current domain.
Responsive Web Design Tester
Responsive Web Design Tester is a quick and easy way to test your responsive website.
Random password generator
A simple random password generator for Opera browser
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
RDS bar
Quick SEO analysis of websites and pages, designed for webmasters and SEOs.
Luminous: JavaScript events blocker
An experimental extension to identify, analyze and block code execution and event collection through JavaScript in your browser.
Custom Style Script
Add Custom JavaScript (JS) Code or Styles (CSS) to any Page.
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.
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
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
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Extension source viewer
View source code of extensions in the Chrome Web Store, Firefox or Opera addon gallery. Has button to install from Chrome Web Store.
JavaScript QR Code
Make QR Codes in JavaScript
stylish-hub
A browser extension that brings a new GitHub experience
DNS Checker - SEO and Domain Analysis
SEO and Domain Analysis Tool by DNS Checker. Provides SEO Report, Meta Redirects and 404s, Client IP, Domain IP & Geo Location, etc
(X)HTML5 Checker
A small extension to validate the markup of current tab
Apple Docs Force Default Language
Forces Apple's developer documentation to always open in a specific language
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!
OctoLinker
OctoLinker – Links together, what belongs together.
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu
AddJS
This extension allows you to add your own custom website specific JavaScript.
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
PixelGrid
The tool to overlap your website layout with a grid.