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Disable Cookies
Disable cookies for current domain.
Custom Style Script
Add Custom JavaScript (JS) Code or Styles (CSS) to any Page.
SEO-tools
SEO-tools - информация о доменах, аудит сайтов на SEO ошибки, а также технический аудит любой страницы. Свыше 100 онлайн сервисов
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
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!
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
Random password generator
A simple random password generator for Opera browser
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
Web Capture for Jira
Take a screenshot, annotate it and upload directly to Jira.
fonts infos
An extention to show/inspect and analyze fonts in web-pages.
JavaScript QR Code
Make QR Codes in JavaScript
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
AddJS
This extension allows you to add your own custom website specific JavaScript.
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
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
(X)HTML5 Checker
A small extension to validate the markup of current tab
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu
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, ...
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
HTTP Headers
Quickly view the HTTP headers of the current tab.
Edit with Paint.Net
Adds a context menu item to send image links directly to Paint.Net photo editor