Modify HTTP request and response headers
Custom Style Script
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
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, ...
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
Modify Header Value
Add, modify or remove a header for any request on desired domains.
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!
PDF API HTML5
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
This extension allows you to add your own custom website specific CSS style sheets.
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
View all HTTP Requests and Responses sent between the Web browser and the Web server.
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
Quickly view the HTTP headers of the current tab.
An extention to show/inspect and analyze fonts in web-pages.
SEO Analysis with Seoptimer
Just one click to SEO Analysis with Seoptimer
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
Website Analysis & SEO Tool
Website SEO audit tool that provides website analysis in SEO, performance, validity, security, accessibility and other criteria.
OctoLinker – Links together, what belongs together.
A small extension to validate the markup of current tab
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
Rabbit URL Opener
Rabbit URL Opener - Bulk URL's Opener Extension just lets you open multiple URLs at once
Web Capture for Jira
Take a screenshot, annotate it and upload directly to Jira.
Random password generator
A simple random password generator for Opera browser
A webpage form filler that populates context specific random test data into forms elements.
The simplest extension for working with web fonts