SeamonkeyNo.1

by alpha.omega101

38 Add-ons in this Collection

Adblock Plus by Wladimir Palant

Rated 5 out of 5 stars 5,659 reviews

13,515,321 users

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).

DownThemAll! by Nils Maier, Federico Parodi, others

Rated 4 out of 5 stars 1,807 reviews

919,989 users

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

NoScript Security Suite by Giorgio Maone

Rated 5 out of 5 stars 1,585 reviews

1,756,796 users

The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.

Stylish by userstyles.org

Rated 4 out of 5 stars 878 reviews

317,881 users

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Tumblr, and many, many other sites. You can even customize Firefox and other programs themselves.

FoxyProxy Standard by Eric H. Jung, groeg, others

Rated 4 out of 5 stars 398 reviews

183,197 users

FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.

Lightning by Mozilla Calendar Project

Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.

Flagfox by Dave G

Rated 5 out of 5 stars 671 reviews

330,683 users

Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...

Web Developer by chrispederick

Rated 5 out of 5 stars 272 reviews

283,945 users

The Web Developer extension adds various web developer tools to the browser.

EPUBReader by epubreader

Rated 4 out of 5 stars 214 reviews

255,526 users

With EPUBReader you can read ePub files just in Firefox. No additional software needed!

United States English Spellchecker by jooliaan

Rated 4 out of 5 stars 165 reviews

341,477 users

United States English Spellchecker for Firefox, Thunderbird and SeaMonkey by Kevin Atkinson and Geoff Kuenning.

To enable, right-click in a multi-line text box, select "Languages", then "English (United States)".

Spanish (Spain) Dictionary by tnarik, RickieES

Rated 4 out of 5 stars 112 reviews

186,903 users

Spanish/Spain Dictionary

ReminderFox by Tom Mutdosch, Daniel Lee

Rated 4 out of 5 stars 490 reviews

47,382 users

ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.

Mozilla Archive Format, with MHT and Faithful Save by Christopher Ottley, Paolo Amadini

Rated 4 out of 5 stars 260 reviews

100,358 users

— Open web pages saved with Internet Explorer or other browsers (MHT)
— Save many tabs, video and audio reliably, in a single ZIP file (MAFF)
— Return to the original site you saved a page from, and more!

NewsFox by Andrey Gromyko, R Pruitt

Rated 4 out of 5 stars 201 reviews

24,407 users

NewsFox is an efficient 3-pane(email) style Atom/RSS feed reader.

Linkification by y5

Rated 4 out of 5 stars 283 reviews

14,302 users

Converts text links into genuine, clickable links...
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