Up & Coming Extensions

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Send Later Button Requires Restart

A simple button to invoke the (already existing) send later functions.

Not yet rated
2,537 users

Rai Smooth Streaming Player (raismth) Requires Restart

Rai.tv live channels, vod and replay contents w/o *light (Silverlight/Moonlight)

Rated 5 out of 5 stars (46)
3,568 users

SeaTab-X-2 Requires Restart

Adds Firefox-style tab closers into SeaMonkey.

Rated 5 out of 5 stars (21)
2,278 users

Live HTTP Headers (clone)

View HTTP headers of a page and while browsing.

This is an unofficial "Live HTTP headers" clone, mainly to fix the Replay feature!

Rated 5 out of 5 stars (5)
3,251 users

True Full Screen in SeaMonkey

This extension enables true full screen mode in SeaMonkey for HTML5 video players, slide-shows, etc. and also for full screen invoked manually with the F11 key.

Rated 5 out of 5 stars (17)
4,296 users

Gmail Manager-community Requires Restart

Manage multiple Gmail accounts and receive new mail notifications.

Rated 4 out of 5 stars (28)
1,227 users

GitHub Extension Installer

Install Browser Extensions straight from GitHub Repositories

Rated 5 out of 5 stars (9)
2,804 users

RC Print Requires Restart

Adds a "Print" option to the Right-Click context menu.

Rated 5 out of 5 stars (2)
1,530 users

RequestPolicy Continued

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.

Rated 4 out of 5 stars (4)
8,205 users

Open With Adobe Illustrator

Open With Adobe Illustrator is a new companion for web designers, graphic designers and in general whom like to use Illustrator.

Rated 3 out of 5 stars (1)
2,830 users

about:addons-memory 2016

Adds a new page that shows add-on memory usage

Rated 5 out of 5 stars (19)
8,008 users

Decentraleyes

Protects you against tracking through "free", centralized, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking. Complements regular content blockers.

Rated 5 out of 5 stars (66)
46,521 users

uBlock Origin

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

Rated 5 out of 5 stars (634)
1,388,508 users

TabSubmit

Lets the user direct the submission of a form to a new tab or window. [Bug #17754]

Rated 5 out of 5 stars (14)
1,610 users

Go Parent Folder Requires Restart

Add "Go Parent Folder" menu to context menu in The Library list view and Search result in Bookmarks Sidebar.

Rated 5 out of 5 stars (109)
9,165 users

Profile Buttons

A button to be able to open the profile folder, along with two buttons to create profiles, and also switch the current profile.

Rated 2 out of 5 stars (3)
1,299 users

HTTPS Everywhere Requires Restart

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.

Rated 4 out of 5 stars (112)
211,663 users

All Menus Button

Show all the menus in a single menu button that can be placed anywhere. Also contains replacement buttons for the default menus.

Rated 5 out of 5 stars (6)
2,149 users

Add-ons Manager Context Menu Requires Restart

Add more items to Add-ons Manager context menu.

Rated 5 out of 5 stars (35)
19,164 users

AdNauseam

Fight back against advertising surveillance

Rated 4 out of 5 stars (6)
4,999 users