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W3DNA
Type '*' plus press "space" and a search term into the Omnibox to open search in new tab.
Window Performance Test
Get accurate performance timing for any page with this extension
Sitemap Explorer: Check and View XML Sitemaps
This extension helps you find, inspect, export, and view XML Sitemap files for any site you navigate in a browser.
Extensions for Mermaid
A browser extension for Chrome, Opera & Firefox that adds Mermaid language support to GitHub. A fork from the not updated GitHub + Mermaid extension.
W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.
Extension Auditor
Browser Extension Security & Privacy Analyzer
Website Links Checker
This tool helps you check all links from a page you are currently viewing.
Open in Vivaldi
Open current page, link, or all tabs in the Vivaldi browser.
Blendup
A tool for web developers to preview blend modes on different page elements.
WebMoney Advisor Next
Internet users feedback about the sites
Page Load Time
Displays page load time in the toolbar
Polypad (Open in App)
Polypad Open in App.
Strike Out Nofollow Links
Just strikes out nofollow links via CSS3 selectors.
TwicPics Companion
Using TwicPics has never been so easy!
Edit with Sublime Text
Live editing text and HTML content of the page with the Sublime Text from the page context or DevTools.
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
sha1 hash generator
Оффлайн SHA1 хеш генератор
Polypane helper
Open the current page or links in Polypane, the developer tool for responsive web development and design.
PX to REM and REM to PX
PX / REM bidirectional converter
InTab - Code CSS 2X Faster
Visually Style Any Website In Any Browser
Octobox
Integrate Octobox directly into your GitHub workflow
GitHub Gloc
Gives you approximate count of lines of code on GitHub
Check Wordpress Version
WordPress Vulnerability Scanner - Scan for vulnerabilities, version, themes, plugins and much more!
TeamCity Notifier
Shows notifications about various events in TeamCity
Web Widgetizer
Web Widgetizer is a extension offering a range of features to enhance browsing. It allows users to create separate Opera windows for specific websites, manage favorite links, customize window dimensions, toggle auto-start, and open links in popup tabs via button click or shortcut (Ctrl + Shift + A). This versatile tool optimizes browsing convenience and efficiency.
retire.js
Scanning website for vulnerable js libraries
Encode Decode HTML
Encode HTML to show it in the HTML pages a code instead of rendered HTML. Decode HTML to convert it back to HTML code
GitHub Privacy
GitHub Timestamp Privacy redacts timestamps such as commit dates on GitHub. The precision of timestamps is reduced according to your preference. Click on individual timestamps to reveal more precision if needed.
CSS3 Button Maker
Is CSS button code generator free easy tool that allows you create beautiful and elegant CSS web buttons in few clicks
Tabby Extension
Easily add BookMarks to Tabby from your preferred browser!
AMP Validator
Automatically checks each page for AMP validation.
Browser Update Watchdog
Notifies you, whenever your browser has been automatically updated.