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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 (24)
73,332 users

ipFood Requires Restart Featured

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

Rated 4 out of 5 stars (8)
68,583 users

RequestPolicy Requires Restart

Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.

Rated 4 out of 5 stars (225)
62,198 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)
61,486 users

Wappalyzer

Wappalyzer is a browser extension that identifies software on websites.

Rated 4 out of 5 stars (107)
60,061 users

Emoji Cheatsheet Featured

A reference for the codes to generate Emojis on popular sites like GitHub or Basecamp and Unicode characters for Twitter and Facebook.
Search Emojis by name or view recently selected items. Emojis are automatically copied to the clipboard.

Rated 4 out of 5 stars (42)
59,378 users

User Agent Overrider

Override browser user agent string

Rated 5 out of 5 stars (60)
59,197 users

Pearl Crescent Page Saver screenshot tool Requires Restart

Save an image of a web page (including Flash content) to a file. Web page screenshots may be captured interactively or from the command line. Options allow you to control the output format (PNG or JPEG), image file name, scaling, and much more.

Rated 4 out of 5 stars (93)
58,944 users

Disable WebRTC

WebRTC leaks your actual IP addresses from behind your VPN, by default.

Rated 5 out of 5 stars (47)
58,684 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 (24)
57,830 users

CacheViewer Requires Restart

This extenion is GUI Front-end of "about:cache"...

Rated 4 out of 5 stars (219)
57,673 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 5 out of 5 stars (49)
57,454 users

User-Agent Switcher Featured

Quickly and easily switch between popular user-agent strings.

Rated 4 out of 5 stars (34)
53,575 users

HttpFox Requires Restart

An HTTP analyzer addon for Firefox

Rated 4 out of 5 stars (171)
52,828 users

IE Tab + (FF 8+, 7, 6, 5, 4, 3.6, 3.5, SeaMonkey) Requires Restart

IE Tab + is an enhanced version of IE Tab. It supports FF 3.5 or greater, integrates IE Tab with Adblock Plus in the IE Tab engine, and synchronizes cookies between IE and Firefox. You can easily import settings from the original IE Tab into IE Tab +

Rated 3 out of 5 stars (88)
49,705 users

SeoQuake SEO extension

Accelerate your SEO efforts on the fly. SEOquake is a free plugin for browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.

Rated 4 out of 5 stars (212)
45,184 users

Autofill Forms Requires Restart

Autofill Forms enables you to fill out web forms with one click.

Rated 3 out of 5 stars (391)
45,134 users

YSlow Requires Restart

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
http://yslow.org is the official open source website.

Rated 3 out of 5 stars (221)
44,490 users

URL Fixer Plus RU and UA Requires Restart

Extended URL Fixer for RU and UA

Rated 4 out of 5 stars (23)
44,134 users

JS Print Setup Requires Restart

Client side Javascript printer settings.
This extension implements print setup from CS Javascript, similar of MeadCo's ScriptX ActiveX control for Internet Explorer.

Rated 5 out of 5 stars (30)
43,014 users