Extensions
ModHeader
Modify HTTP request and response headers
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
SEO-tools
Modify Header Value
Add, modify or remove a header for any request on desired domains.
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!
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
Luminous: JavaScript events blocker
An experimental extension to identify, analyze and block code execution and event collection through JavaScript in your browser.
Custom Style Script
Add Custom JavaScript (JS) Code or Styles (CSS) to any Page.
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
fonts infos
An extention to show/inspect and analyze fonts in web-pages.
stylish-hub
A browser extension that brings a new GitHub experience
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
HTTP Headers
Quickly view the HTTP headers of the current tab.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
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, ...
Web Sniffer
View all HTTP Requests and Responses sent between the Web browser and the Web server.
AddJS
This extension allows you to add your own custom website specific JavaScript.
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
(X)HTML5 Checker
A small extension to validate the markup of current tab
ColorHexa - Color Information and Conversion
Color tool converting and providing information about any color.
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu
.no { CSS }
Opera 12 reminiscent Shift-G CSS zapper (use Alt-G)
OctoLinker
OctoLinker – Links together, what belongs together.
JavaScript QR Code
Make QR Codes in JavaScript
Web Capture for Jira
Take a screenshot, annotate it and upload directly to Jira.