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Responsive Web Design Tester
Responsive Web Design Tester is a quick and easy way to test your responsive website.
SEO-tools
SEO-tools - информация о доменах, аудит сайтов на SEO ошибки, а также технический аудит любой страницы. Свыше 100 онлайн сервисов
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.
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Squeezeimg - convert & compress images, WEBP, JP2
This extension will optimization image a page using Squeezeimg
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.
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.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
JavaScript QR Code
Make QR Codes in JavaScript
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
HTTP Headers
Quickly view the HTTP headers of the current tab.
NsLookup - Find DNS Records
A simple and powerful tool for querying DNS records
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
Modify Header Value
Add, modify or remove a header for any request on desired domains.
NetworkMonitor
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
(X)HTML5 Checker
A small extension to validate the markup of current tab
Web Capture for Jira
Take a screenshot, annotate it and upload directly to Jira.
SelectorsHub
xPath plugin to auto generate, write and verify xpath & cssSelector.
Website scripting
Developers can add javascript codes in webpage. Like customizing other websites with our own codes.
OctoLinker
OctoLinker – Links together, what belongs together.
Nextsense XML Signing Component
Signing XML document.
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!
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
Webfonting it!
The simplest extension for working with web fonts
PageSpeed Insights
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
.no { CSS }
Opera 12 reminiscent Shift-G CSS zapper (use Alt-G)