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JavaScript Debugger

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 (48)
171,599 users

ChatZilla Featured

A clean, easy to use and highly extensible Internet Relay Chat (IRC) client.

Rated 4 out of 5 stars (124)
171,071 users

The Amazon 1Button App for Firefox No Restart

Compare prices at thousands of retail sites with the Amazon 1Button App!
Get special offers and features right at your fingertips. Search Amazon and the Web at the same time, get a head-start on deals, add to your wishlist, and much more.

Rated 4 out of 5 stars (32)
167,231 users

SkipScreen -- download helper, now for sale...

We’re sorry to say we can’t maintain Skipscreen anymore. We’d love to see someone carry on with it. If you’d like to buy Skipscreen, or otherwise find it a good home, please contact us at admin@worcesterllc.com.

Rated 4 out of 5 stars (629)
165,647 users

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

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 (82)
164,065 users

Personal Menu (Personal Firefox Button)

Bring back your personal and powerful Firefox Button!

Rated 4 out of 5 stars (403)
163,892 users

Gmail Manager

The original Gmail notifier for multiple accounts. Allows you to receive new mail notifications along with viewing account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.

Rated 4 out of 5 stars (1,339)
163,381 users

Clear Cache Button

Adds a clear cache toolbar button. After installing the extension, find the clear cache button in the toolbar customization...

Rated 4 out of 5 stars (128)
162,544 users

Screengrab (fix version) Featured

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

Rated 5 out of 5 stars (239)
159,067 users

Toolbar Buttons Featured

Adds toolbar buttons to the customize toolbar window in several programs including Firefox, Thunderbird and SeaMonkey. Some of the buttons make commonly preformed actions quicker, others add new functionality.

Rated 4 out of 5 stars (320)
158,739 users

PDF Viewer No Restart

PDF.js brings Portable Document Format (PDF) reading capabilities to your browser using web standard technologies.

Please report issues to: https://github.com/mozilla/pdf.js/issues

Rated 4 out of 5 stars (263)
157,951 users

PDF Download

Use PDF Download to do whatever you like with PDF files on the Web. Regain control and eliminate browser problems, view PDFs directly in Firefox as HTML, and use the all-new Web-to-PDF toolbar to save and share Web pages as high-quality PDF files.

Rated 2 out of 5 stars (677)
157,480 users

Status-4-Evar

Status bar widgets and progress indicators for Firefox 4+

Rated 5 out of 5 stars (531)
155,217 users

Copy Urls Expert

Provides options to 'Copy Urls of All Opened Tabs in Current Window', 'Copy Urls of Tabs in All Windows', 'Copy Urls of All Links in Selected Text' and 'Copy Urls of All Images in Selection'. Allows to open multiple tabs.

Rated 5 out of 5 stars (59)
154,089 users

DOM Inspector

DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.

Rated 5 out of 5 stars (60)
153,772 users

Fasterfox

The One; The Original Fasterfox Gives performance & network tweaks for Firefox. Fasterfox makes your browsing so much faster!
Make your Sites Faster than a Fox with Fasterfox for FireFox!

Rated 4 out of 5 stars (91)
152,486 users

Webmail Ad Blocker No Restart Featured

Expand your email area by blocking and removing ads on the right hand side of the screen when using Gmail, Hotmail, Outlook.com and Yahoo Mail.

Rated 4 out of 5 stars (180)
149,948 users

Belgium eID

Use the Belgian electronic identity card (eID) in Firefox

Rated 3 out of 5 stars (75)
148,921 users

Easy Screenshot

Capture a screenshot of the whole webpage, and save in your desktop in default.

Rated 4 out of 5 stars (55)
148,601 users

RESTClient, a debugger for RESTful web services.

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 (75)
147,427 users