SeamonkeyNo.1

by alpha.omega101

38 Add-ons in this Collection

Adblock Plus by Wladimir Palant

Rated 5 out of 5 stars 5,824 reviews

14,537,028 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).

NoScript Security Suite by Giorgio Maone

Rated 5 out of 5 stars 1,636 reviews

1,757,282 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.

DownThemAll! by Nils Maier, Federico Parodi, others

Rated 4 out of 5 stars 1,884 reviews

958,526 users

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

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.

FoxyProxy Standard by Eric H. Jung

Rated 4 out of 5 stars 463 reviews

188,291 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.

Stylish by userstyles.org

Rated 4 out of 5 stars 909 reviews

405,686 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.

Web Developer by chrispederick

Rated 5 out of 5 stars 285 reviews

315,251 users

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

Flagfox by Dave G

Rated 5 out of 5 stars 698 reviews

341,278 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...

EPUBReader by epubreader

Rated 4 out of 5 stars 218 reviews

274,446 users

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

United States English Spellchecker by jooliaan

Rated 3 out of 5 stars 168 reviews

399,837 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 114 reviews

251,721 users

Spanish/Spain Dictionary

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

Rated 5 out of 5 stars 288 reviews

108,285 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!

ReminderFox by Tom Mutdosch, Daniel Lee

Rated 4 out of 5 stars 496 reviews

51,566 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.

WorldIP - Geo Add-on with Security Features by Alrond

Rated 5 out of 5 stars 119 reviews

19,929 users

Professional Geo Add-on with security features and advanced network tools. Anti-phishing. Protection against DNS spoofing and fake sites. All DNS records for domain. The real location of web server, country flag, extended information about datacenter

RequestPolicy by Justin Samuel

Rated 4 out of 5 stars 206 reviews

13,726 users

Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.
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