Interface Customizations

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IMAP Received Date Requires Restart

Make the “Received” column in IMAP folders show when messages were actually received.

Rated 5 out of 5 stars (6)
2,025 users

YouTube Anywhere Player

Watch videos anywhere in cinema mode without leaving the website you're on.

Rated 5 out of 5 stars (65)
16,605 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)
4,416 users

Customizations for Adblock Plus

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

Rated 5 out of 5 stars (13)
13,287 users

Sea Fox Requires Restart

Transform SeaMonkey into Firefox 3.x

Rated 5 out of 5 stars (7)
440 users

InspectorWidget Requires Restart

Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.

Rated 5 out of 5 stars (9)
1,185 users

Duplicate Tab Requires Restart

Duplicate Tab allows you to clone a tab along with its...

Rated 5 out of 5 stars (181)
516 users

Remember Mismatched Domains Requires Restart

The Remember Mismatched Domains extension for Firefox and Thunderbird adds a "Don't warn me again about this certificate for this domain" checkbox to the Domain Mismatch and Expired Certificate warning windows. When selected the domain...

Rated 5 out of 5 stars (66)
2,391 users

FolderFlags Requires Restart

Allows users to edit the flags Thunderbird sets on folders.

Rated 5 out of 5 stars (8)
4,381 users

Linkification Requires Restart

Converts text links into genuine, clickable links...

Rated 4 out of 5 stars (310)
21,393 users

Restartless Restart

This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.

Rated 4 out of 5 stars (216)
19,757 users

Edit Bookmark Plus Requires Restart

Resize 'Add Bookmark' Popup / 'Edit This Bookmark' Popup, fixes tree selection bug, option to disable popup auto close & Update Url and/or Name of a bookmark with the Url/Title of current page.

Replacement of OpenBook addon

Rated 4 out of 5 stars (71)
3,719 users

Tab Numbers

Keeps track of your browser tab number.

Rated 5 out of 5 stars (5)
708 users

Big Navigation

enlarging the navigation links on the pages

Rated 5 out of 5 stars (6)
623 users

ImageTweak: zoom/rotate images and videos! Requires Restart

A no-clutter image viewer for Firefox that allows you to zoom, rotate and display images/videos against a custom background. ImageTweak is a must-have addon for any photographer or photography-loving user.

Rated 4 out of 5 stars (100)
4,166 users

Open With Opera

Open With Opera sends pages, links, tabs and images from Mozilla Firefox to Opera.

Rated 5 out of 5 stars (5)
1,401 users

Stylish Requires Restart

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.

Rated 4 out of 5 stars (863)
430,415 users

Compact Menu 2 Requires Restart

Add a compact menu button to the navigation toolbar, and hide the menu bar.

Rated 4 out of 5 stars (353)
6,298 users

Tab Wheel Scroll

Switch tabs by scrolling with the mouse wheel in the tab bar.

Rated 4 out of 5 stars (126)
10,880 users

Single Key Tab Switch Requires Restart

Single Key Tab Switch provides configurable single hotkeys for switching tabs, like the 'Single-key shortcuts' feature of the Opera browser.

Rated 4 out of 5 stars (28)
1,091 users