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HackBar Requires Restart

Simple security audit / Penetration test tool.

Rated 4 out of 5 stars (50)
26,489 users

FirePHP Requires Restart

FirePHP enables you to log to your Firebug Console using a simple PHP method call.

Not using Firebug 1.9+ on Firefox 8+? See http://firephp.org/

Rated 4 out of 5 stars (51)
24,408 users

FireSSH Requires Restart Featured

FireSSH is a free, cross-platform SSH terminal client for Mozilla Firefox. Written entirely in Javascript!

Rated 4 out of 5 stars (97)
24,042 users

XPath Checker Requires Restart

An interactive editor for XPath expressions.

Rated 5 out of 5 stars (22)
23,335 users

Selenium Expert (Selenium IDE) Requires Restart

This plugin is my attempt to bring the wonderful world of inspections, tips, hints, fixes and refactoring to Selenese! The Selenium Expert goes through your selenium test cases suggesting improvements, giving tips and even lets you apply them.

Rated 4 out of 5 stars (2)
23,056 users

React Developer Tools Compatible with Firefox 57+

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)
22,263 users

View Cookies Requires Restart

It adds a tab to the Page Info dialog box, which shows the cookies belonging to the current page.

Rated 4 out of 5 stars (49)
21,606 users

Search by Image for Google

Google Search by Image:

Use rightclick on an image to quickly find out the source of an image, how it is used, or find higher resolution versions via Google Reverse Image search.
(Google Image Search is similar to Tineye Reverse image search).

Rated 4 out of 5 stars (122)
20,914 users

Abduction! - Webpage Screenshots Screen Capture Requires Restart

1) Capture an page or just a specific region.
2) Adds a right click option to take screen shots of an entire web page or just part of a web page to save as an image.

VIDEO: http://youtu.be/vpnPvNShpWQ

Rated 4 out of 5 stars (529)
20,445 users

Clear Console Requires Restart Featured

One click to clear your cache, cookies, history, html5/local storage, http logins, all of them or restart your browser with/without notifications.

Rated 4 out of 5 stars (64)
20,395 users

Rainbow Color Tools Requires Restart

Color tools for web development.

Color picker and eyedropper + saving colors and trying out colors with drag and drop.

Rated 5 out of 5 stars (95)
20,334 users

Open With Requires Restart

Quickly test out your web pages in Internet Explorer, Chrome, Safari, or Opera. Open With opens the current page in your other browsers with just one click. Add Open With to your menus, toolbars and developer toolbox today!

Rated 4 out of 5 stars (160)
20,098 users

Auto Refresh Requires Restart

Auto Refresh will refresh or hard refresh any tab or group of tabs at individual or group intervals.

You can also customize your presets and save the ones you most use.

http://www.grizzlyape.com/addons/auto-refresh/

Rated 3 out of 5 stars (47)
19,871 users

about:addons-memory

Adds an about:addons-memory page that details add-on memory usage

Rated 4 out of 5 stars (130)
19,392 users

Form History Control Requires Restart

Manage form history entries (search, edit, cleanup, export/import) and easy text formfiller.

Auto-save text entered in any form while typing to allow fast recovery when disaster strikes.

Control for which webpage form history is saved or not.

Rated 5 out of 5 stars (93)
19,324 users

Firesizer Requires Restart

Allows you to resize the window to specific dimensions.

NOTE: Users of Firefox 29 and above must install "The Addon Bar" extension to use this, as Firesizer uses the add-on bar that has been removed in Firefox 29.

Rated 4 out of 5 stars (126)
18,932 users

SAML tracer

Debug and view SAML messages

Rated 4 out of 5 stars (10)
18,654 users

IP Address and Domain Information

The Ultimate online investigation tool! See detailed information about every IP Address, Domain Name and Provider.

Rated 4 out of 5 stars (24)
17,801 users

FoxyProxy Basic Requires Restart

FoxyProxy Basic is a simple on/off proxy switcher. More advanced features and configuration options are offered by FoxyProxy Standard.

Rated 4 out of 5 stars (31)
17,552 users

FlashDisable

Toolbar button that lets you disable and re-enable Flash with just one click.

Rated 5 out of 5 stars (50)
17,331 users