Up & Coming Extensions

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OverbiteFF

Add legacy protocol support back to Firefox and SeaMonkey with OverbiteFF, which restores support for Gopher servers, plus CSO/ph searches, finger, whois and more! Cross-platform JavaScript runs anywhere Firefox does.

Rated 5 out of 5 stars (19)
4,029 users

Extra Format Buttons

Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.

Rated 5 out of 5 stars (8)
5,081 users

Themes Menu

Adds Themes menu to the Tools and Titlebar menus. Includes toolbar icon.

Rated 4 out of 5 stars (16)
15,287 users

Join-NG

Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".

Rated 5 out of 5 stars (2)
2,350 users

Trueblock Plus

Trueblock Plus is a fork of the Adblock Plus extension for blocking unwanted advertisements on the web. This fork provides the exact same features as Adblock plus, with the unpopular, unwanted "acceptable ads" (non-)feature turned off by default.

Rated 4 out of 5 stars (45)
1,399 users

Customizations for Adblock Plus No Restart

This extension provides various customization options for the Adblock Plus user interface.

Rated 5 out of 5 stars (12)
16,374 users

LastPass Password Manager

LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.

Rated 4 out of 5 stars (1,350)
723,683 users

SmoothWheel

Scrolls the page smoothly when scrolling the mouse wheel (or keyboard arrows if enabled).

Rated 5 out of 5 stars (259)
36,969 users

South African English spell checker

The South African English spell checker allows you to use place names, borrowed words, and other expressions that are unique to South Africa.

"No more eina, just a lekker spell checker!"

Rated 5 out of 5 stars (3)
2,019 users

Controle de Scripts

Controle de Scripts is an extension that allows you to control what JavaScripts do on your browser.

Rated 4 out of 5 stars (28)
2,641 users

GNotifier No Restart

Add-on for Firefox and Thunderbird. Replaces built-in notifications with the OS native notifications. It supports most Linux Desktop Environments, Windows 8.1 & 10.

Rated 5 out of 5 stars (11)
11,180 users

Whois Lookup & Hosting & DNS & Site Flags Firefox

IP Whois Lookup & Website Reviews & Rating. Display country flag indicating website location. Alexa and Norton Antivirus Site Adviser. Supported: GoDaddy, NetworkSolutions, Dotster, 1and1, NameCheap, Register, Yahoo, 123-Reg, FatCow, Enom, FastHosts.

Rated 3 out of 5 stars (9)
6,260 users

PrefBar

The all in one toolbar(item). Houses and manages bigger amounts of buttons (Clear Cache, Clear Cookies, ...), Menus (User Agent spoof...) and checkboxes (Javascript, Flash, ...). Extensible from online-database or with self created buttons.

Rated 5 out of 5 stars (39)
15,496 users

Form History Control

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 (83)
24,846 users

Zombie Keys (Multilanguage Keyboard)

Enter accents, diacritics, diaeresis, umlauts, ligatures etc. with keyboards of various countries (us,uk,ie,fr,it,ru,de,sv) - via easy to remember shortcuts or menu. Also supports all textboxes of the application (such as search, filters).

Rated 5 out of 5 stars (22)
1,311 users

Theme Font & Size Changer No Restart

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 (170)
96,638 users

Nuke Anything Enhanced

Allows you to hide almost anything via context menu 'Remove Object'.

Rated 5 out of 5 stars (126)
21,118 users

MathML-fonts No Restart

Fonts for Mozilla's MathML engine.

Rated 5 out of 5 stars (2)
2,411 users

Private Tab No Restart

Adds private tabs.

Rated 5 out of 5 stars (216)
69,647 users

mid

More than 2000 dictionaries in 270 Kilobyte! Search multiple dictionaries at once!

Rated 4 out of 5 stars (10)
1,054 users