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HTML 5 Validator

Adds a 'HTML 5 Validator' context menu item to a page's context menu.

Rated 3 out of 5 stars (5)
4,225 users

Udacity Front End Feedback Compatible with Firefox 57+

Immediate, visual feedback about any website's HTML, CSS and JavaScript.

Rated 3 out of 5 stars (5)
274 users

HTML5 Outliner

Displays the HTML5 document outline of the current web page. HTML5 Outlines are composed of labels for important structural elements (e.g., heading text, table titles, form titles etc).
Source Code: https://github.com/arky/html5-outliner-addon

Rated 2 out of 5 stars (10)
726 users

Extended Cookie Manager Requires Restart

Easier cookie managment for Firefox

Rated 2 out of 5 stars (70)
4 users

Go to WindizUpdate Requires Restart

Have you heard of WindizUpdate? It is designed to provide an alternative to Windows Update which will run in Firefox, Netscape or Opera. I guess you know what this means, the final obstacle from being 100% IE free has just been knocked down, you...

Rated 2 out of 5 stars (8)
0 users

IMGCafe.com Image Uploader Requires Restart

Easy and fast image uploading from a simple right click...

Rated 3 out of 5 stars (2)
20 users

UploadCC: Screen Capture Tool (Share or Save) Compatible with Firefox 57+

Simple Screen Capture Tool
Select the area which you want to capture.
You can choose to upload it and share with your friend or download it.

Rated 3 out of 5 stars (2)
425 users

Yandex.Metrika Requires Restart

Go to the reports, download maps links, the addition of the counter, etc.

Rated 2 out of 5 stars (7)
971 users

Broken Image Finder

The scope of the Broken Image Finder Add-on is to detect unavailable images by scanning the currently visited website and its embedded stylesheets.

Rated 3 out of 5 stars (2)
306 users

Hackbar. Requires Restart

修改了浮夸的界面,爱护眼睛才是第一.感谢r0oth3x49升级!By Darkmelody.

Rated 3 out of 5 stars (2)
1,907 users

Easy Clear Cache

One click to clear browser cache.

F.A.Q.
Q. Is this a joke?
A. No, it is just a button the clears the cache

Q. Where is the button?
A. It should be at the top next to the menu, if it is not, go to customize to see all buttons

Rated 3 out of 5 stars (2)
83 users

Basic Calculator

Basic Calculator that you can use.... with HotKeys support.

Hotkeys
SHIFT+ALT+Z - to open/close the panel

Hope it is useful for all of you ...

Rated 3 out of 5 stars (2)
187 users

FireKnockout

Small extension to Firebug which adds an option to inspect the current Knockout context to the Firebug context menu on DOM elements.

Rated 3 out of 5 stars (2)
161 users

blitz-firefox

Instantly load test your app from around the world with just a few clicks. No scripting and no test creation.

Rated 3 out of 5 stars (2)
29 users

Shortest URL shortener ever

Shortest URL shortener ever shortens the current page's URL and copies it to the clipboard with a single click.

Rated 3 out of 5 stars (2)
69 users

SeLite Settings Requires Restart

It provides template-based visual interface and API to Firefox preferences. It allows preferences to be organised in sets and have single-valued and multi- valued free-type or choice fields.

Rated 3 out of 5 stars (2)
113 users

Developer Profile Requires Restart

Easily set up an extension development environment.

Rated 3 out of 5 stars (2)
112 users

bugmagnet

A port of the Chrome Extension 'BugMagnet' originally written by Gojko Adzic, Bug Magnet enables you to quickly populate common text fields with a variety of test data via a right-click context menu, extremely useful in exploratory testing.

Rated 3 out of 5 stars (2)
433 users

LIVE HTTP Header Requires Restart

View Live HTTP Response Header of All Websites in Pop Up Window.

Rated 3 out of 5 stars (2)
0 users

Google Cache Compatible with Firefox 57+

Google Cache lets you visit retrieve the web page from Google Web Cache when the site is offline.

Rated 3 out of 5 stars (2)
533 users