Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
PDF API HTML5
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!
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Disable cookies for current domain.
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
Custom Style Script
View all HTTP Requests and Responses sent between the Web browser and the Web server.
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
Code tree for GitHub
Quickly view the HTTP headers of the current tab.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
WordPress Theme and Plugins Detector
Detects the theme and plugins used in WordPress and display information about them.
OctoLinker is the easiest and best way to navigate between files and projects on GitHub.com. Files containing the following keywords will now have links that redirect you either to the relative file or to the projects GitHub page. Depending on the value, it may redirect you to an external website like a manual page or another service.
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
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, ...
Java Interview Questions
This is an Speed Dial extension for Java Interview Questions & Answers
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Browse JSON like you do it in Finder.
Corser - Authorize CORS requests
Cross-browser extension for authorizing cross-origin resource sharing (CORS) requests. This extension can be installed on browsers supporting the WebExtensions API (https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions) It intercepts all CORS requests and responses headers, and records/adds/changes their values so as to authorized unauthorized CORS requests. Use this extension only for testing purposes
Use Redux DevTools in the DevTools
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
An extention to show/inspect and analyze fonts in web-pages.
ColorHexa - Color Information and Conversion
Color tool converting and providing information about any color.
This extension allows you to add your own custom website specific CSS style sheets.
Zend Debugger Toolbar
Provides integration with Zend debugging and profiling tools.
Open in GIMP photo editor
Adds a context menu item to send images directly to GIMP photo editor
GitHub (Enterprise) Projects Plus
[Deprecated] Adds advanced labels management and other functionality to GitHub.