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Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
.no { CSS }
Opera 12 reminiscent Shift-G CSS zapper (use Alt-G)
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
Nextsense XML Signing Component
Signing XML document.
HTTP Headers
Quickly view the HTTP headers of the current tab.
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.
CF-Predictor
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
PixelGrid
The tool to overlap your website layout with a grid.
Tabby Opera Extension
Easily add BookMarks to Tabby from Opera!
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.
Hitsteps Visitor Manager
Get your website analytics insight and get notified about updates and live support requests in your dashboard
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
(X)HTML5 Checker
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
Selenium Page Object Generator
A nimble and flexible Selenium Page Object Model generator to improve agile testing process velocity.
Website scripting
Developers can add javascript codes in webpage. Like customizing other websites with our own codes.
Webfonting it!
The simplest extension for working with web fonts
retire.js
Scanning website for vulnerable js libraries
GitHub Extension
The GitHub Browser Extension allows GitHub users to quickly find and open all of their assigned issues and pull requests from a single location. It can be handy for developers and project managers to view their tasks.
Ninja Van Tracking
Track your Ninja Van Tracking Onilne
OctoLinker
OctoLinker – Links together, what belongs together.
Strike Out Nofollow Links
Just strikes out nofollow links via CSS3 selectors.
Browser Update Watchdog
Notifies you, whenever your browser has been automatically updated.
GitHub Gloc
Gives you approximate count of lines of code on GitHub
W3DNA
Type '*' plus press "space" and a search term into the Omnibox to open search in new tab.
Income monitor
Fast balance viewer for your affiliate networks and partner programs
W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.
HypeStat Analyzer
Check any website's traffic
Check Wordpress Version
WordPress Vulnerability Scanner - Scan for vulnerabilities, version, themes, plugins and much more!