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Add extra features and styles to make SeaMonkey your own.

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Most Popular Extensions

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Kaskus Quick Reply+ Requires Restart

provide a quick reply feature, under circumstances capcay required

Rated 5 out of 5 stars (6)
97 users

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Lightbird Requires Restart

Standalone calendar UI for Lightning

Rated 4 out of 5 stars (21)
96 users

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Contact Photos Requires Restart

Displays contact photos in the message header.

Rated 4 out of 5 stars (31)
86 users

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Awesome ldapInfoShow

Show contact photo and other info from Local Dir, Addressbook, LDAP, Facebook, LinkedIn, Flickr, Gravatar etc

Rated 4 out of 5 stars (14)
79 users

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SQLite Manager Requires Restart

Manage any SQLite database on your computer.

Rated 4 out of 5 stars (354)
78 users

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Bluhell Firewall

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

Rated 4 out of 5 stars (498)
78 users

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Speed Start

Speed Dial & Start Page with flexible layout for fast access to sites via visual bookmarks

Rated 5 out of 5 stars (82)
73 users

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Customizations for Adblock Plus

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

Rated 5 out of 5 stars (15)
70 users

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FireFTP Requires Restart

FireFTP is a free, secure, cross-platform FTP/SFTP client for Waterfox which provides easy and intuitive access to FTP/SFTP servers.

Check out my new project, FireSSH!

Rated 4 out of 5 stars (1,071)
66 users

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CuteButtons

Adds icons to buttons and/or menus.

Rated 4 out of 5 stars (95)
66 users

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Private Tab

Adds private tabs.

Rated 5 out of 5 stars (312)
65 users

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Download Status Bar

If you are the kind of person who likes to have total control over every aspect of your downloads, "Download Status Bar" is the add-on you are looking for.

Rated 5 out of 5 stars (437)
65 users

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Silent Block

Minimum and fast URL blocker.

Rated 4 out of 5 stars (31)
63 users

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WebRTC Permissions UI Toggle Requires Restart

A toolbar button for SeaMonkey to bypass the missing WebRTC permissions dialog and temporarily allow media capture.

Not yet rated
59 users

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Simple Locale Switcher Requires Restart

An easier management of the user interface language

Rated 5 out of 5 stars (14)
56 users

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Dark Background and Light Text (SeaMonkey)

Makes every page to have light text on dark background (exact colors are customizable)

Firefox version is here: https://addons.mozilla.org/firefox/addon/dark-background-light-text/

Rated 5 out of 5 stars (3)
56 users

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QuickNote Requires Restart

A simple note-taking extension.

Rated 5 out of 5 stars (204)
51 users

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Tiny JavaScript Debugger

TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavaScript.

Rated 5 out of 5 stars (8)
51 users

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PlayFlash 32bit Requires Restart

Flash player plugin - unofficial xpi repack for 32bit browsers.
Use when official plugin installer is not suitable.
All binary files are copyrighted by their authors and distributed for free.

Rated 5 out of 5 stars (24)
51 users

Download for Windows

Diagnostics for Adblock Plus

Diagnostics tool for Adblock Plus, provides some insight into internal processes of Adblock Plus.

Rated 3 out of 5 stars (4)
46 users

Download Now