Leudachain
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
RDS bar
Quick SEO analysis of websites and pages, designed for webmasters and SEOs.
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
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, ...
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Random password generator
A simple random password generator for Opera browser
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
SEO-tools
stylish-hub
A browser extension that brings a new GitHub experience
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
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.
AddJS
This extension allows you to add your own custom website specific JavaScript.
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!
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
.no { CSS }
Opera 12 reminiscent Shift-G CSS zapper (use Alt-G)
fonts infos
An extention to show/inspect and analyze fonts in web-pages.
(X)HTML5 Checker
A small extension to validate the markup of current tab
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
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
Web Capture for Jira
Take a screenshot, annotate it and upload directly to Jira.
JavaScript QR Code
Make QR Codes in JavaScript
CF-Predictor
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
NoFollow
Outlines nofollow links, detects nofollow and noindex meta tags on webpages. Features website filtering and custom CSS outline styles
MenuButton
Custom menu allows the user to create a menu to access various network resources.
Lorem Fill
A webpage form filler that populates context specific random test data into forms elements.
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu