Alix allows you to lint your HTML for Accessibility issues simply by applying a stylesheet that makes use of advanced CSS selectors.
SEO Nofollow links highlighter
Highlight all nofollow links on any site you want. Excellent for SEO purposes.
Zend Debugger Toolbar
Provides integration with Zend debugging and profiling tools.
Open in Vivaldi
Open current page, link, or all tabs in the Vivaldi browser.
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
Scanning website for vulnerable js libraries
Web Developer Checklist
Analyses any web page for violations of best practices
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
This extension show the element of a document in a tree view!
Luminate Online Page Editor
Edit Luminate Online pages with just one click.
OctoLinker – Links together, what belongs together.
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.
Browser Update Watchdog
Notifies you, whenever your browser has been automatically updated.
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
Colored favicons for Salesforce
Make the favicon in different color based on which salesforce instance your are loggen into.
Open in GIMP photo editor
Adds a context menu item to send images directly to GIMP photo editor
Can be used to view KML/KMZ Files in the browser.
Modify O Tabs
Automatically pin or rename a tab of a site you specify or change its icon.
SEO Wykop - wycena stron, analiza SEO
.net exception beutifier
Beautifies the standard .net error screen
CSS Gradient Inspector
Extends the Developer Tools, adding a sidebar that displays information about the gradients applied to the inspected element.
md5 hash generator
MD5 hash generator (offline mode)
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
TO Helper allows you speed up your daily work as Chat Mod.
GitHub Source Code Minimap
GitHub Source Code Minimap
Nextsense XML Signing Component
Signing XML document.
SEO TOOLS - YATEO
Opens all the essential tools for SEO in one click.
An extention to show/inspect and analyze fonts in web-pages.