IMAP Received Date Requires Restart
Make the “Received” column in IMAP folders show when messages were actually received.
Watch videos anywhere in cinema mode without leaving the website you're on.
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.
This extension provides various customization options for the Adblock Plus user interface.
Sea Fox Requires Restart
Transform SeaMonkey into Firefox 3.x
InspectorWidget Requires Restart
Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.
Duplicate Tab Requires Restart
Duplicate Tab allows you to clone a tab along with its...
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...
FolderFlags Requires Restart
Allows users to edit the flags Thunderbird sets on folders.
Linkification Requires Restart
Converts text links into genuine, clickable links...
This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.
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
Keeps track of your browser tab number.
enlarging the navigation links on the pages
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.
Open With Opera sends pages, links, tabs and images from Mozilla Firefox to Opera.
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.
Compact Menu 2 Requires Restart
Add a compact menu button to the navigation toolbar, and hide the menu bar.
Switch tabs by scrolling with the mouse wheel in the tab bar.