Interface Customizations

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Duplicate Tab Blocker

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 (11)
32 weekly downloads

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)
32 weekly downloads

Link Status Redux Requires Restart

Shows an indicator on the status bar in front of the link address when the mouse cursor is over a link to a page you have bookmarked or visited before.

Rated 5 out of 5 stars (23)
29 weekly downloads

Open With Vivaldi Browser

Open With Vivaldi Browser sends pages from Mozilla Firefox to Vivaldi browser.

Rated 5 out of 5 stars (1)
29 weekly downloads

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 (26)
29 weekly downloads

Big Navigation

enlarging the navigation links on the pages

Rated 5 out of 5 stars (8)
29 weekly downloads

Tab Clicking Options Requires Restart

Select actions for various clicking events on a tab or the tab...

Rated 4 out of 5 stars (70)
26 weekly downloads

Dybutar

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

Rated 5 out of 5 stars (12)
25 weekly downloads

SeaMonkey Vertical Tab Bar Requires Restart

Tab bar on the side of the window for SeaMonkey.

Rated 5 out of 5 stars (5)
25 weekly downloads

CheckBoxMate Lefedor Edition Requires Restart

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 (14)
24 weekly downloads

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)
24 weekly downloads

HashColouredTabs+ Requires Restart

Improves tab identification by providing a small colored icon for any site which doesn't have its own 'site icon'.
★ 'favicon' now also shown in history and bookmarks ★

Rated 4 out of 5 stars (38)
23 weekly downloads

Flexible Sidebar

Flexible Sidebar allows to change sidebar width by dragging the handles.

Not yet rated
22 weekly downloads

Tategaki Requires Restart

Tategaki allows vertical writing-mode on mail compose window.

Not yet rated
21 weekly downloads

Export All Certificates Requires Restart

Adds an option to export all root certificates.

Rated 2 out of 5 stars (3)
18 weekly downloads

Zorcher Requires Restart

Selecting a small text on the page do not need to copy it into the search bar of your browser or search engine. Just press the right mouse button and select the search service from the available list.

Rated 5 out of 5 stars (10)
17 weekly downloads

Password Mask Changer

Changes the mask character used in password fields.

Rated 5 out of 5 stars (4)
17 weekly downloads

Zing! Locale Switcher

Want to change from one language to another? Zing! and the locale is switched.

Rated 5 out of 5 stars (2)
16 weekly downloads

TaQuilla Requires Restart

Automatic tagging using Bayesian statistics

Rated 4 out of 5 stars (13)
16 weekly downloads

AMO Browsing for SeaMonkey

This extension makes browsing for extensions easier at addons.mozilla.org. It fixes incorrect information about some extensions being not available for SeaMonkey and adds links to the Add-on Converter where needed.

Rated 5 out of 5 stars (3)
16 weekly downloads