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.
This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.
Stylish-Custom Requires Restart
custom additions to Stylish extension
See more search results etc. on one page, concatenating several pages together...
Show all the menus in a single menu button that can be placed anywhere. Also contains replacement buttons for the default menus.
Restores version numbers for all installed add-ons inside Add-on Manager on Firefox, Thunderbird and Seamonkey.
xSidebar Requires Restart Featured
Firefox style sidebars for SeaMonkey...
jQuery Requires Restart
jQuery and jQuery UI embedded in browser
Adds buttons to toggle the using the default page colors and fonts, and the page defined colors and fonts.
Key config Requires Restart
This add-on provides configurable keyboard shortcuts for several actions and a dialog to customize them.
All shortcuts can be redefined in Tools -> Key settings
Telegram Web Messenger brings Telegram right into your Firefox Sidebar.
Stylish Tools Requires Restart
Quicker access to several Stylish features through a toolbar button and/or keyboard shortcuts. Available for Firefox, Thunderbird, and SeaMonkey
HTML5 Loop Requires Restart
Loop HTML5 Video and Music.
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
Darkens the background of the page
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.
WebPG for Mozilla Requires Restart
An extension which provides GnuPG/GPG/PGP related functions to Moizilla Firefox, Thunderbird and Seamonkey
Restores the default image style used for top-level images in previous versions of Firefox.
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