Extension source viewer
View source code of extensions in the Chrome Web Store, Firefox or Opera addon gallery. Has button to install from Chrome Web Store.
GitHub (Enterprise) Projects Plus
[Deprecated] Adds advanced labels management and other functionality to GitHub.
Disable cookies for current domain.
Picture in Play
Indicates whether the `picture` element is in use on a page.
Custom Style Script
PDF API HTML5
NsLookup - Find DNS Records
A simple and powerful tool for querying DNS records
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
Extensions for Mermaid
A browser extension for Chrome, Opera & Firefox that adds Mermaid language support to GitHub. A fork from the not updated GitHub + Mermaid extension.
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, ...
A browser extension that brings a new GitHub experience
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!
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu
DNS Checker - SEO and Domain Analysis
SEO and Domain Analysis Tool by DNS Checker. Provides SEO Report, Meta Redirects and 404s, Client IP, Domain IP & Geo Location, etc
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
A small extension to validate the markup of current tab
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Web Capture for Jira
Take a screenshot, annotate it and upload directly to Jira.
Modify Header Value
Add, modify or remove a header for any request on desired domains.
A webpage form filler that populates context specific random test data into forms elements.
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
OctoLinker – Links together, what belongs together.
The tool to overlap your website layout with a grid.