Opera Inside SeaMonkey

by d4rkn1ght

65 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,828 reviews

2,112,241 users

Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...

uBlock Origin by Raymond Hill

Rated 5 out of 5 stars 474 reviews

1,011,570 users

Finally, an efficient blocker. Easy on CPU and memory.

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 983 reviews

1,276,934 users

Customize the way a web page displays or behaves, by using small bits of JavaScript.

NoScript Security Suite by Giorgio Maone

Rated 5 out of 5 stars 1,568 reviews

2,240,852 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.

Ghostery by Ghostery

Rated 4 out of 5 stars 1,297 reviews

1,486,238 users

Enjoy a faster, safer and cleaner browsing experience.

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.

HTTPS Everywhere by EFF Technologists

Rated 4 out of 5 stars 70 reviews

182,042 users

Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.

FoxyProxy Standard by Eric H. Jung, groeg, others

Rated 4 out of 5 stars 355 reviews

283,810 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.

Web Developer by chrispederick

Rated 5 out of 5 stars 228 reviews

495,331 users

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

FireFTP by Mime Čuvalo

Rated 4 out of 5 stars 948 reviews

493,861 users

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

Check out my new project, FireSSH!

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 46 reviews

196,787 users

Manage any SQLite database on your computer.

ImportExportTools by Paolo "Kaosmos"

Download Now

Experimental

Rated 4 out of 5 stars 139 reviews

351,706 users

Adds some tools to import and export folders and messages

Speed Dial by Josep del Rio

Rated 4 out of 5 stars 1,265 reviews

371,007 users

Direct access to your most visited websites

Password Exporter by Justin Scott (fligtar), Jorge Villalobos

Rated 4 out of 5 stars 336 reviews

195,843 users

This extension allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported later.

Session Manager by Michael Kraft

Rated 5 out of 5 stars 458 reviews

285,710 users

Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.
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