Interface Customizations

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Add Search Engines for SeaMonkey

Add missing search-engine detection to SeaMonkey

Rated 4 out of 5 stars (2)
70 users

Big Navigation No Restart

Increases the navigation links on the pages

Rated 5 out of 5 stars (4)
952 users

Black background and white text No Restart

Makes black background and white text on every page

Rated 5 out of 5 stars (16)
4,195 users

Blue Essence Seamonkey Theme

Dark navigator theme based on a default Classical theme and now works on Linux :)

Rated 4 out of 5 stars (5)
15 users

Browser View

Open links, pages, and bookmarks in any other browser, using right-click context menus or with one click of the drop-down or standalone toolbar buttons. Modify any menu, browser name or location. Incognito/private browsing mode is also supported.

Rated 4 out of 5 stars (40)
1,834 users

CheckBoxMate Lefedor Edition

Check multiple checkboxes by drawing a rectangle around them. FF6 version.
I've made this version since i did need it for use with RTM,

Rated 4 out of 5 stars (9)
1,249 users

Classic Toolbar Buttons No Restart

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.

Beta builds on versions page!

Rated 5 out of 5 stars (140)
43,101 users

CloseTab

Lightweight add-on which adds to right-click menu 3 items allowing to close current tab, open a new one and reopen closed one. Right-click anywhere on site instead of using keyboard or finding buttons.

Rated 4 out of 5 stars (3)
793 users

Compact Menu 2

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

Rated 4 out of 5 stars (347)
9,834 users

Custom Buttons

Gives a possibility to create custom toolbarbuttons...

Rated 4 out of 5 stars (82)
93,886 users

Customizations for Adblock Plus No Restart

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

Rated 5 out of 5 stars (11)
23,308 users

CuteButtons - Crystal SVG

add icons to buttons/menus/anywhere (CuteMenus - Crystal SVG not required)

Rated 4 out of 5 stars (84)
10,403 users

CuteMenus - Crystal SVG

Note from Mozilla: This add-on has been discontinued. Try Menu Icons Plus instead.

Adds icons to all menus along with some other features...

Rated 4 out of 5 stars (103)
6,765 users

Display Mail User Agent

Displays icon for user agent of received mails.

Rated 4 out of 5 stars (102)
37,801 users

Drag-Select Link Text No Restart

Select link text with easy drag gestures.

Rated 5 out of 5 stars (13)
518 users

Duplicate Tab

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

Rated 5 out of 5 stars (182)
1,254 users

Duplicate Tab Blocker No Restart

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.

Rated 3 out of 5 stars (10)
980 users

Duplicate This Tab

This add-on provides the much needed feature update of Tab Duplication to Mozilla Browsers. Features Supported include Duplication of Browser Tabs, Detaching Tabs and Merging All Windows.

Rated 4 out of 5 stars (43)
11,012 users

Dybutar No Restart

Dynamic creation of bookmark-style toolbar buttons which you can customize.

Rated 5 out of 5 stars (5)
168 users

Edit Bookmark Plus

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 (56)
4,122 users