JS on/off status bar button
Tategaki allows vertical writing-mode on mail compose window.
AMO Browsing for SeaMonkey No Restart
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.
Open With Internet Explorer No Restart
Open With Internet Explorer sends pages from Mozilla Firefox to Internet Explorer.
Restart Application Button No Restart
Restart Application Button lets you restart your Firefox and SeaMonkey application by a quick toolbar button click.
GNotifier No Restart
Add-on for Firefox and Thunderbird. Replaces built-in notifications with the OS native notifications. It supports most Linux Desktop Environments, Windows 8.1 & 10.
Allows to customize GNOMErunner theme
custom additions to Stylish extension
Open With Vivaldi Browser No Restart
Open With Vivaldi Browser sends pages from Mozilla Firefox to Vivaldi browser.
Speed Start No Restart
Speed Dial & Start Page with flexible layout for fast access to sites via visual bookmarks
Undo Close Tab Button No Restart
Reopens the last closed tab.
Profile Buttons No Restart
A button to be able to open the profile folder, along with two buttons to create profiles, and also switch the current profile.
Reload Skip Cache Button No Restart
Reload page without using content stored in the browser cache to make sure you get any updates.
Add-ons Manager - Version Number No Restart
Restores version numbers for all installed add-ons inside Add-on Manager on Firefox, Thunderbird and Seamonkey.
Open With Google Chrome No Restart
Open With Google Chrome sends pages from Mozilla Firefox to Google Chrome.
Open With Opera No Restart
Open With Opera sends pages, links, tabs and images from Mozilla Firefox to Opera.
All Menus Button No Restart
Show all the menus in a single menu button that can be placed anywhere. Also contains replacement buttons for the default menus.
Page Colors & Fonts Buttons No Restart
Adds buttons to toggle the using the default page colors and fonts, and the page defined colors and fonts.
Page Navigation Buttons No Restart
Adds a few buttons to help with page navigation, including Page Top, Page Bottom, Page Down and Page Up.