Extensions
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.
RDS bar
Quick SEO analysis of websites and pages, designed for webmasters and SEOs.
stylish-hub
A browser extension that brings a new GitHub experience
Responsive Web Design Tester
Responsive Web Design Tester is a quick and easy way to test your responsive website.
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
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
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Web Capture for Jira
Take a screenshot, annotate it and upload directly to Jira.
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
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!
Advanced Site Checker
Check your site for issues.
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
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, ...
Random password generator
A simple random password generator for Opera browser
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
fonts infos
An extention to show/inspect and analyze fonts in web-pages.
AddJS
This extension allows you to add your own custom website specific JavaScript.
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
Edit with Paint.Net
Adds a context menu item to send image links directly to Paint.Net photo editor
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
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
PageSpeed Insights
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
.no { CSS }
Opera 12 reminiscent Shift-G CSS zapper (use Alt-G)