Extensions
Add new functionality to Opera
CryptoPro Extension for CAdES Browser Plug-in
Расширение позволяет использовать КриптоПро ЭЦП Browser plug-in в браузере. Для работы требует установленного ЭЦП Browser plug-in.
EditThisCookie
EditThisCookie is a cookie manager. You can add, delete, edit, search, protect and block cookies!
Stylus
Redesign the web with Stylus, a user styles manager. Stylus allows you to easily install themes and skins for many popular sites.
Super Auto Refresh
Auto-refresh (reload) pages, on a selected interval. NO ADs. SUPER EASY.
Web Mirrors
User-Agent Switcher
User-Agent Switcher is a quick and easy way to switch between user-agents.
Контур.Плагин
Web Developer
Adds a toolbar button with various web developer tools. The official port of the Web Developer extension for Firefox.
Save All Images
a customizable extension to save selected images from the current tab page
JavaScript Switcher
Quick way to enable/disable Javascript
Помощник диагностики
JSON Lite
Fast JSON viewer - highlights, shows items count/size, handles large files
Podpis elektroniczny Szafir SDK
Open in Google Chrome
Open current page, link, or all tabs in the Chrome browser.
SeoQuake extension
SEOquake is a free plugin that provides you with key SEO metrics, along with other useful tools such as SEO Audit and many others
RestMan
RESTMan is a browser extension to work on http requests.
HTML5 Editor
HTML5 Editor with CSS, JS, HTML validator and beautify code
TV Emulator
The Vewd TV Simulator enables any developers to test and debug their HTML5 apps for the Vewd App Store.
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.
Font Finder
An easy-to-use font inspector to get CSS styles of the selected element
PerfectPixel by WellDoneCode
This extension helps develop your websites with per pixel accuracy!
RESTED
A REST client for the rest of us
Firebug Lite for Opera 15+
Full Screen
Go full screen with one click on the full screen button. That includes also the full screen movies such as YouTube, Vimeo, etc.
Cookie Editor
Edit cookies related to the current page and all its sub-frames right from a popup
RDS bar
Quick SEO analysis of websites and pages, designed for webmasters and SEOs.
CORS Toggle
Adds Access-Control-Allow-Origin, Access-Control-Allow-Methods and Access-Control-Allow-Headers headers for CORS.
Internet Speed Test
Test your internet connection speed (upload and download) from a toolbar panel
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!
Responsive Web Design Tester
Responsive Web Design Tester is a quick and easy way to test your responsive website.
Disable Cookies
Disable cookies for current domain.
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.