PDF API HTML5
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Firebug Lite for Opera 15+
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
GitHub code tree on steroids
Use Redux DevTools in the DevTools
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Click on any HTML element to get the font info in a popup
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!
Browse JSON like you do it in Finder.
Picture in Play
Indicates whether the `picture` element is in use on a page.
This extension allows you to add your own custom website specific CSS style sheets.
View all HTTP Requests and Responses sent between the Web browser and the Web server.
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.
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, ...
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
The simplest extension for working with web fonts
Quickly view the HTTP headers of the current tab.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
Open in GIMP photo editor
Adds a context menu item to send images directly to GIMP photo editor
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
An extention to show/inspect and analyze fonts in web-pages.
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
A browser extension that brings a new GitHub experience