Leudachain
Picture in Play
Indicates whether the `picture` element is in use on a page.
(X)HTML5 Checker
A small extension to validate the markup of current tab
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
ModHeader
Modify HTTP request and response headers
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.
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.
stylish-hub
A browser extension that brings a new GitHub experience
Tabby Extension
Easily add BookMarks to Tabby from your preferred browser!
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Nextsense XML Signing Component
Signing XML document.
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
fonts infos
An extention to show/inspect and analyze fonts in web-pages.
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
Polypane helper
Open the current page or links in Polypane, the developer tool for responsive web development and design.
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.
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
Open in Pale Moon
Open current page, link, or all tabs in the Pale Moon 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.
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, ...
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
TeamCity Notifier
Shows notifications about various events in TeamCity
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
AddJS
This extension allows you to add your own custom website specific JavaScript.
Apple Docs Force Default Language
Forces Apple's developer documentation to always open in a specific language
GitHub Projects Plus
Adds advanced labels management and other functionality to GitHub.
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
PageSpeed Insights
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.