Quick SEO analysis of websites and pages, designed for webmasters and SEOs.
Firebug Lite for Opera 15+
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Modify HTTP request and response headers
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
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!
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, ...
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
A browser extension that brings a new GitHub experience
An extention to show/inspect and analyze fonts in web-pages.
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
This extension allows you to add your own custom website specific CSS style sheets.
View all HTTP Requests and Responses sent between the Web browser and the Web server.
Random password generator
A simple random password generator for Opera browser
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
Nextsense XML Signing Component
Signing XML document.
Mini-Browser for Multitasking
Use web utilities/tools without leaving the tab
Quickly view the HTTP headers of the current tab.
ColorHexa - Color Information and Conversion
Color tool converting and providing information about any color.
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
A small extension to validate the markup of current tab