Web Development

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SQLite Manager Requires Restart

Manage any SQLite database on your computer.

Rated 4 out of 5 stars (83)
144,960 users

RESTClient, a debugger for RESTful web services. Requires Restart

Notice: some important features (XML indentation and load old saved requests) are missing in version 2.0.0, please update to version 2.0.1.

Please follow the link ("View other versions") below To install version 2.0.1.

Rated 4 out of 5 stars (109)
128,106 users

IE Tab Requires Restart

IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...

Rated 4 out of 5 stars (1,224)
121,849 users

Selenium IDE Requires Restart

Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests.

Rated 4 out of 5 stars (55)
112,779 users

Nimbus Screen Capture - editable screenshots Compatible with Firefox 57+

1) Screen capture web pages.
2) Selected regions.
3) Whole browser windows.
4) Slack direct upload (NEW!)
Edit screenshots and save images as local file or Google Drive. Annotate screenshots with different tools. Upload and share!

Rated 4 out of 5 stars (379)
112,657 users

Modify Headers Requires Restart

Add, modify and filter the HTTP request headers sent to web servers. This addon is particularly useful for Mobile web development, HTTP testing and privacy.

Rated 4 out of 5 stars (77)
112,298 users

Screengrab (fix version) Requires Restart

Screengrab! saves webpages as images.
0.99 released!
New features: upload to internet

Rated 5 out of 5 stars (265)
96,868 users

Emoji Keyboard Compatible with Firefox 57+ Featured

A free extension of the web tool https://emojikeyboard.org. It helps input emoji in the web browser with an extensive search functionality.

Rated 4 out of 5 stars (72)
96,469 users

MeasureIt Requires Restart

Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

Rated 4 out of 5 stars (343)
95,861 users

Image Zoom Requires Restart

Adds zoom and rotation functionality for images...

Rated 4 out of 5 stars (342)
95,361 users

FirePath Requires Restart

FirePath is a Firebug extension that adds a development tool to edit, inspect and generate XPath 1.0 expressions, CSS 3 selectors and JQuery selectors (Sizzle selector engine).

Rated 4 out of 5 stars (26)
92,001 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 (74)
90,093 users

HttpRequester Requires Restart

A tool for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions.

Rated 4 out of 5 stars (67)
88,997 users

ipFood Requires Restart

Simulate the use of a series of proxy changing at each new connection.

Rated 4 out of 5 stars (10)
87,774 users

Text Link Requires Restart

Allows URI texts written in webpages to be loaded by double clicks.

Rated 4 out of 5 stars (293)
86,548 users

Live HTTP Headers Requires Restart

View HTTP headers of a page and while browsing.

Rated 4 out of 5 stars (177)
86,524 users

JSONView

View JSON documents in the browser.

Rated 5 out of 5 stars (177)
86,327 users

Remote XUL Manager

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

Rated 5 out of 5 stars (34)
85,772 users

JavaScript Debugger Requires Restart

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

Rated 4 out of 5 stars (50)
80,059 users

colorPicker

A very simple extension for learning web page colors. Copy the RGB or Hex color code of any pixel displayed in your browser to the clipboard (in CSS/HTML format). Similar in function to Internet Explorer's color picker.

Rated 4 out of 5 stars (47)
76,898 users