Extensions
Random password generator
A simple random password generator for Opera browser
Picture in Play
Indicates whether the `picture` element is in use on a page.
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.
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
Custom Style Script
Add Custom JavaScript (JS) Code or Styles (CSS) to any Page.
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
NFT Scanner
Scan your NFT assets.
SEO-tools
SEO-tools - информация о доменах, аудит сайтов на SEO ошибки, а также технический аудит любой страницы. Свыше 100 онлайн сервисов
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
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!
RDS bar
Quick SEO analysis of websites and pages, designed for webmasters and SEOs.
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.
stylish-hub
A browser extension that brings a new GitHub experience
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, ...
AddJS
This extension allows you to add your own custom website specific JavaScript.
HTTP Headers
Quickly view the HTTP headers of the current tab.
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
View Page Source
Get access to the page source with the click of a button
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
Webmaster menu
Adds new items to browser context menu that open various analyzes of browsed web pages and sites.
Modify Header Value
Add, modify or remove a header for any request on desired domains.
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
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
PixelGrid
The tool to overlap your website layout with a grid.
JavaScript QR Code
Make QR Codes in JavaScript
(X)HTML5 Checker
A small extension to validate the markup of current tab
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
.no { CSS }
Opera 12 reminiscent Shift-G CSS zapper (use Alt-G)