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Default Responsive Design View

This add-on starts your browser in responsive design view by default.

Rated 5 out of 5 stars (1)
1,847 users

Simple Lorem Ipsum Compatible with Firefox 57+

This extension provides a simple Lorem Ipsum paragraph, which can be inserted into web form fields.

Rated 3 out of 5 stars (9)
1,502 users

One-click Screenshot Compatible with Firefox 57+

Take screenshots of entire websites. Simple as that.

Rated 5 out of 5 stars (7)
1,694 users

Header Tool Requires Restart

Open in a sidebar or in a tab and write headers directly. Simplicity, JS substitution, built-in functions, encryption, and regexp support.
You can easy modify header on each HTTP call on the Mozilla Firefox.

Rated 3 out of 5 stars (18)
3,859 users

Print for Firefox Compatible with Firefox 57+

Print the current page you see.

Rated 5 out of 5 stars (2)
1,047 users

trello-card-counter

Display Trello list number of cards

Rated 5 out of 5 stars (2)
1,217 users

AInspector Sidebar Requires Restart

AInspector Sidebar evaluates the accessibility compliance of web pages based on WCAG 2.0 Level A and AA requirements using OpenAjax Alliance rulesets. It organizes the evaluation results by Rule Categories and WCAG Guidelines.

Rated 5 out of 5 stars (11)
2,439 users

React Developer Tools

React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the React tab.

Rated 5 out of 5 stars (8)
23,161 users

Live HTTP Headers (Fixed By ITWorld.com.pk) Requires Restart

View HTTP headers of a page and while browsing.
Live HTTP Header Fix By Danyial ITs Working On Firefox Again Fixed Reply Problem

Rated 4 out of 5 stars (5)
2,104 users

XUL Gear Requires Restart

IDE for FireFox plug-in developers and business analysts who create User Interface mock-ups. A WYSIWYG XUL editor

Rated 5 out of 5 stars (14)
1,174 users

Policy Control (noScript, noCSS, noMedia, ...)

This extension helps you quickly disable and enable different types of resources such as JavaScript, CSS, and Media. The extension can be used to increase privacy as well as saving bandwidth by blocking unwanted contents.

Rated 4 out of 5 stars (11)
2,502 users

Clear Cache Requires Restart

Clear Cache was developed to make it easier for Web development, clearing your browser cache (RAM and DISK) by pressing a button or via the F9 key.

F9 Fever! ;)

Rated 4 out of 5 stars (29)
22,579 users

Fontface Ninja

Explore fonts within a website, try and buy them !

Rated 5 out of 5 stars (5)
4,770 users

Task Manager

Task Manager to see the CPU and Memory usage of the tabs, works best when using e10s to be able to see the total process memory usage.

Rated 4 out of 5 stars (18)
4,112 users

Cookies Manager+ Requires Restart

Cookies manager to view, edit and create new cookies. It also shows extra information about cookies, allows edit multiple cookies at once and backup/restore them.

Rated 5 out of 5 stars (72)
113,085 users

Cross Domain - CORS

Cross Domain will help you to deal with cross domain - CORS problem. This is a small tool will helpful for web developer and related domain that face with cross domain issue.

Rated 2 out of 5 stars (3)
1,910 users

Canvas Defender

Instead of completely blocking canvas fingerprinting, Canvas Defender add-on creates a unique and persistent noise that hides your real canvas fingerprint. This add-on protects you while browsing both in normal and private mode.

Rated 4 out of 5 stars (10)
3,855 users

IE View Requires Restart

Lets you load pages in IE with a single right-click, or mark certain sites to *always* load in IE.

Rated 3 out of 5 stars (155)
65,790 users

aXe Developer Tools

Add accessibility auditing to the Firefox Developer Tools

Rated 5 out of 5 stars (4)
2,297 users

Live HTTP Headers (clone)

View HTTP headers of a page and while browsing.

This is an unofficial "Live HTTP headers" clone, mainly to fix the Replay feature!

Rated 4 out of 5 stars (7)
6,033 users