GitHub code tree on steroids
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Disable cookies for current domain.
Click on any HTML element to get the font info in a popup
Firebug Lite for Opera 15+
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
Use Redux DevTools in the DevTools
View all HTTP Requests and Responses sent between the Web browser and the Web server.
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!
Quickly view the HTTP headers of the current tab.
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, ...
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
Picture in Play
Indicates whether the `picture` element is in use on a page.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
Browse JSON like you do it in Finder.
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
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.
Get Thumbnails or Image to video YouTube
Effettuate miniature o immagini da video di YouTube
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
Web Developer Checklist
Analyses any web page for violations of best practices
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
Flag & WHOIS SEO Domain Full Info
Return the domain's IP address , information about security, localization of server, ping, etc.
Selenium Page Object Generator
A nimble and flexible Selenium Page Object Model generator to improve agile testing process velocity.
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
This extension allows you to add your own custom website specific CSS style sheets.
A webpage form filler that populates context specific random test data into forms elements.