Modify Header Value
Add, modify or remove a header for any request on desired domains.
Use Redux DevTools in the DevTools
Edit the Page
Toggles the 'Design Mode' so that you can edit the contents of the page.
PDF API HTML5
Firebug Lite for Opera 15+
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Click on any HTML element to get the font info in a popup
Corser - Authorize CORS requests
Cross-browser extension for authorizing cross-origin resource sharing (CORS) requests. This extension can be installed on browsers supporting the WebExtensions API (https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions) It intercepts all CORS requests and responses headers, and records/adds/changes their values so as to authorized unauthorized CORS requests. Use this extension only for testing purposes
Browse JSON like you do it in Finder.
WordPress Theme and Plugins Detector
This tool detects theme and plugins used on WordPress sites and displays information about them.
View all HTTP Requests and Responses sent between the Web browser and the Web server.
Picture in Play
Indicates whether the `picture` element is in use on a page.
This extension allows you to add your own custom website specific CSS style sheets.
Edit with Adobe Photoshop
Adds a context menu item to send image links directly to Adobe Photoshop photo editor
Quickly view the HTTP headers of the current tab.
Get Thumbnails or Image to video YouTube
Make thumbnail previews or images from YouTube videos
ChroPath for Opera
AutonomIQ offers a developers platform ChroPath to generate and validate unique selectors like relative xpath with iframe support
This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.
Open in Vivaldi
Open current page, link, or all tabs in the Vivaldi browser.
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!
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
A webpage form filler that populates context specific random test data into forms elements.
This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.
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, ...
Open in GIMP photo editor
Adds context menu items to send image links and image files directly to the GIMP photo editor
Google Analytics Debugger
A browser extension for debugging Google Analytics tracking code
Shows the response times and uptime of a desired server. Useful to see how performs internet or a wireless access point.
Website Color Changer
Extends the Developer Tools, adding a sidebar for colors manipulation