BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Firebug Lite for Opera 15+
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
GitHub on steroids
PDF API HTML5
Custom Style Script
Modify HTTP request and response headers
View all HTTP Requests and Responses sent between the Web browser and the Web server.
Use Redux DevTools in the DevTools
This extension allows you to add your own custom website specific CSS style sheets.
A browser extension that brings a new GitHub experience
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!
ColorHexa - Color Information and Conversion
Color tool converting and providing information about any color.
Browse JSON like you do it in Finder.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
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, ...
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
Remove cookie(s) for the current domain
Remove cookie(s) for the current site with just one click
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
The simplest extension for working with web fonts
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
Quickly view the HTTP headers of the current tab.
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support