Rozšíření
Octotree
GitHub code tree on steroids
Font Inspector
Click on any HTML element to get the font info in a popup
Firebug Lite for Opera 15+
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!
SEO-tools
Modify Header Value
Add, modify or remove a header for any request on desired domains.
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
RemoteDev DevTools
Use Redux DevTools in the DevTools
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, ...
Right Click Validator
Right click on any webpage to validate it using the W3 NUValidator service.
Get Thumbnails or Image to video YouTube
Vytvořte miniaturu nebo obrázky z videí YouTube
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
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
AddCSS
This extension allows you to add your own custom website specific CSS style sheets.
Remove cookie(s) for the current domain
Remove cookie(s) for the current site with just one click
Web Sniffer
View all HTTP Requests and Responses sent between the Web browser and the Web server.
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
NoFollow
Outlines nofollow links, detects nofollow and noindex meta tags on webpages. Features website filtering and custom CSS outline styles
HTTP Headers
Quickly view the HTTP headers of the current tab.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
JSON Finder
Browse JSON like you do it in Finder.
PageSpeed Insights
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
CF-Predictor
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
Picture in Play
Indicates whether the `picture` element is in use on a page.
Luminous: JavaScript events blocker
An experimental extension to identify, analyze and block code execution and event collection through JavaScript in your browser.
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation
AddJS
This extension allows you to add your own custom website specific JavaScript.
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
Web Developer Checklist
Analyses any web page for violations of best practices
Nextsense XML Signing Component
Signing XML document.
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