Featured Extensions

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DownThemAll! Requires Restart Featured

The first and only download manager/accelerator built inside Firefox!

Rated 4 out of 5 stars (1,769)
1,206,914 users

User Agent Switcher Requires Restart Featured

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Rated 4 out of 5 stars (263)
317,704 users

QrCodeR Featured

Encode selection, links and images to QrCode with right-click.

Rated 5 out of 5 stars (70)
7,407 users

Gmail Notifier (restartless) Featured

Multiple account (or label) Gmail notifier (without storing passwords)

Rated 4 out of 5 stars (266)
91,462 users

Download Plan Featured

An addon to download files at specific time interval

Rated 4 out of 5 stars (5)
5,455 users

Free Memory Featured

An add-on to perform free-memory operations without visiting about:memory.
For Firefox 40+, try Free Memory 2.0 https://addons.mozilla.org/en-US/firefox/addon/free-memory-20/

Rated 4 out of 5 stars (55)
20,879 users

Lightbeam for Firefox Featured

Lightbeam is a Firefox add-on that enables you to see the first and third party sites you interact with on the Web. Using interactive visualizations, Lightbeam shows you the relationships between these third parties and the sites you visit.

Rated 4 out of 5 stars (420)
431,796 users

Google Translate Anywhere (Dictionary Anywhere) Featured

Google Translate (Dictionary) Anywhere provides access to a floating multilingual Google Translate panel on any webpage.

Rated 4 out of 5 stars (29)
11,256 users

Duplicate Tabs Closer Featured

Detects and automatically closes duplicate tabs.

Rated 4 out of 5 stars (37)
7,175 users

User-Agent Switcher Featured

Quickly and easily switch between popular user-agent strings.

Rated 4 out of 5 stars (27)
54,506 users

YouTube Enhancer Plus Requires Restart Featured

Improve your watching experience! Ad Blocker, Autoplay Manager, Auto HD, Auto Replay, Cinema Mode, and more.

Rated 5 out of 5 stars (119)
66,934 users

Tab Memory Usage Featured

Tab Memory Usage displays the amount of memory is used by each tab

Rated 4 out of 5 stars (31)
38,947 users

Adblock Plus Featured

Blocks annoying video ads on YouTube, Facebook ads, banners and much more.

Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Rated 5 out of 5 stars (4,842)
19,118,712 users

Slim Add-ons Manager Featured

The Add-ons Manager slims down!
This add-on reduces the height of entries in the Add-on Manager, so you can display more of them at a time.

Rated 5 out of 5 stars (50)
8,897 users

Google™ Translator Lite Featured

Google™ Translator Lite

Rated 4 out of 5 stars (30)
45,898 users

Reload Plus Featured

Supercharge your reload button and hotkeys!

Rated 5 out of 5 stars (80)
24,157 users

QR Code Image Generator Featured

Create a QR Code of the selected text or current URL. Use CTRL-SHIFT-Q to quickly see the QR Code. Also possible to create a QR Code from free text within Firefox. Works completely offline! Now with UTF8 support.

Rated 4 out of 5 stars (24)
17,086 users

YouTube Anywhere Player Featured

Watch videos anywhere in cinema mode without leaving the website you're on.

Rated 5 out of 5 stars (63)
22,205 users

Bluhell Firewall Featured

Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.

Rated 5 out of 5 stars (287)
112,418 users

LeechBlock Requires Restart Featured

LeechBlock is a simple productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.

Rated 5 out of 5 stars (612)
74,057 users