Darkens the background of the page
SeaTab-X-2 Requires Restart
Adds Firefox-style tab closers into SeaMonkey.
Tabs Menu Requires Restart
Adds a Tabs menu to the main menu that lets you easily change between tabs.
IMAP Received Date Requires Restart
Make the “Received” column in IMAP folders show when messages were actually received.
A full featured color selector tool, to work with colors, and easily find the colors you want.
The "Responsible Blocker" arrives to save the Internet, this extension blocks all those annoying ads, but allows only small and acceptable ads, so the websites you like can continue online.
The "Responsible Blocker" arrives to save the Internet
RC Print Requires Restart
Adds a "Print" option to the Right-Click context menu.
Enhanced Priority Display Requires Restart
Enhanced thread pane display of message priorities.
Password Tags Requires Restart
Adds metadata and sortable tags to the password manager.
Export All Certificates Requires Restart
Adds an option to export all root certificates.
Want to change from one language to another? Zing! and the locale is switched.
Reload page without using content stored in the browser cache to make sure you get any updates.
InspectorWidget Requires Restart
Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.
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.
Fierr Requires Restart
Replaces the error page with a more stylish appearance with additional features.
FolderFlags Requires Restart
Allows users to edit the flags Thunderbird sets on folders.
Prevent duplicate tabs. Allow only one tab for a url. If you click a link that is already opened in a tab, then existing tab would be focused instead of opening a new tab. This works even across firefox windows.
Reopens the last closed tab.
NiceReader Requires Restart
NiceReader is designed for web reading. You can customize font, color, size, background, specify the elements to read, filiter ad elements, filiter ad strings, automaticaly turn page.