BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
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.
Firebug Lite for Opera 15+
Use Redux DevTools in the DevTools
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
PDF API HTML5
Custom Style Script
Disable cookies for current domain.
This extension allows you to add your own custom website specific CSS style sheets.
Browse JSON like you do it in Finder.
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, ...
A browser extension that brings a new GitHub experience
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
View all HTTP Requests and Responses sent between the Web browser and the Web server.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
ColorHexa - Color Information and Conversion
Color tool converting and providing information about any color.
An extention to show/inspect and analyze fonts in web-pages.
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.
The simplest extension for working with web fonts
A small extension to validate the markup of current tab
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!
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
Selenium Page Object Generator
A nimble and flexible Selenium Page Object Model generator to improve agile testing process velocity.