Featured Extensions

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Converter Featured

Contextual (inline) unit, timezone, and currency converter on any web site, plus custom conversions for offline text. Shopping assistant also included -- find the best deals online! (Currency conversions and shopping assistant disabled by default.)

Rated 5 out of 5 stars (73)
10,531 users

Classic Toolbar Buttons No Restart Featured

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.

Beta builds on versions page!

Rated 5 out of 5 stars (138)
42,468 users

ColorfulTabs Featured

The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface. For Seamonkey & Flock. An essential. F...

Rated 4 out of 5 stars (963)
261,276 users

Status-4-Evar Featured

Status bar widgets and progress indicators for Firefox 4+

Rated 5 out of 5 stars (531)
152,605 users

CoolPreviews Featured

Browse faster—Preview links and images without leaving your current page or tab. Just mouseover any link and a preview window appears to display the content.

Rated 4 out of 5 stars (660)
103,509 users

Stratiform Featured

Stratiform is the ultimate user friendly customization add-on for Firefox. It puts the power in the average user's hands to customize the browser's look.

Rated 5 out of 5 stars (173)
17,637 users

LeechBlock 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 (477)
84,407 users

Clear Console 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 (57)
38,122 users

Ecosia — The search engine that plants trees! No Restart Featured

Ecosia is a search engine that donates 80% of its surplus income to a tree planting program in Burkina Faso.
By searching with Ecosia you can help the environment for free.

This extension adds Ecosia as a search engine in Firefox. Give it a try!

Rated 5 out of 5 stars (129)
76,670 users

Adblock Plus No Restart 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 (4,815)
21,677,788 users

Video Resumer No Restart Featured

Automatically resumes YouTube videos from where you played them last. Without this extension, for example, when you click through YouTube videos, back and forth, they always start from the beginning.

Rated 5 out of 5 stars (37)
24,475 users

SaveAS Featured

Save AS anything with a click of a button. It is handy for web image collection addicts.

Rated 3 out of 5 stars (17)
20,578 users

Theme Font & Size Changer No Restart Featured

Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.

Rated 5 out of 5 stars (140)
93,629 users

Wired-Marker Featured

Wired-Marker(http://www.wired-marker.org/en/) is a permanent (indelible) highlighter that you use on Web pages. The highlighter, which comes in various colors and styles, is a kind of electronic bookmark that serves as a guide when you revisit a Web ...

Rated 4 out of 5 stars (135)
12,171 users

The Addon Bar (Restored) No Restart Featured

Gives you a place to put all your add-on buttons without over-crowding the navigation bar.

Rated 5 out of 5 stars (246)
143,432 users

Tab notifier Featured

Enables desktop notifications like in Chrome (e.g. Gmail, imo.im) and, if the site doesn't support them, it can notify new messages or updates detecting changes of the title (e.g. Hotmail, Yahoo, Facebook, Twitter). Even if the browser is minimized!

Rated 4 out of 5 stars (36)
6,554 users

Bluhell Firewall No Restart 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 (209)
142,797 users

YouTube Anywhere Player No Restart Featured

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

Rated 5 out of 5 stars (51)
35,660 users

Public Fox Featured

Block downloads, lock down bookmarks/addons/downloads with a password.

Rated 4 out of 5 stars (152)
218,823 users

Slim Add-ons Manager No Restart 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 (44)
11,890 users