Elasticvue is a free and simple elasticsearch gui for your browser

Toggle debug mode of an Odoo webpage.
- Click for debug.
- Double click for debug with Assets.
- Use ctrl + . for keyboard shortcut

Source code:
https://github.com/pga-odoo/OdooDebug

Emoji art supplied by Emojione

Quickly test out your web pages in Chrome, Edge, Safari, or Opera. Open With opens the current page in your other browsers with just two clicks.

This add-on displays the result of evaluating XPath expression or CSS selector.

Open SWF links of Adobe Animate (Flash) in a pure sandboxed JavaScript emulator

Allows to change the language identifier sent to webservers to whatever language you need.

A simple yet powerful CSS property viewer. For Firefox Quantum

Allows to visualize the electricity consumption and greenhouse gases (GHG) emissions that your Internet browsing leads to.

Automatically change the user agent after a specified period of time to a randomly selected one, thus hiding your real user agent

A browser extension that lets you display the basic typographic styles of a text by right-clicking it.

Edit cookies related to the current page and all its sub-frames right from a popup

Download login-protected files from the command line using curl, wget or aria2.

A simple pomodoro clock to hack your productivity.

Blocks the ”seen” feature of the facebook messenger, and your friends will no longer be able to see if you read their messages.

Go full screen with one click on the full screen button. That includes also the full screen movies such as the YouTube, Vimeo, Dailymotion, Youku video player, etc.

Instant SEO analysis and website reviews for SEO, mobile, usability and social media. The freshest data when and where you want it.

MIDI support for browsers

Pixel Perfect Pro helps developers and designers
to make best sites and more high quality products.

Web extension based version of LiveReload. Supports Firefox 57 (Firefox Quantum)

The leading browser extension for analytics and marketing technology testing and debugging

The extension rewrite the header (request or response) based on a rules table. It 's possible to add, modify or remove header fields for a choosen url pattern. It's possible to import/export the configuration

Construct custom Web Socket requests and handle responses to directly test your Web Socket services.

Open-Source Color Picker for Websites and Desktop Apps. With ColorFish you can get a color reading from any point in your browser and desktop. ColorFish is the only eyedropper browser extension with desktop color selection support.

php dev tools integrated to your browser

EditThisCookie is a cookie manager.

Add custom JavaScript codes or styles to any page.

Control the HTTP Referer on a per-site basis.

select some text, and base64 decode it.

Extends the Developer Tools, adding tools for debugging and profiling Angular applications.

PixelZoomer takes a screenshot of the current website and provides various tools for pixel analysis. You can zoom into websites (up to 3200%), measure distances and pick colors with an eye dropper.