Welcome to SeaMonkey Add-ons.
Add extra features and styles to make SeaMonkey your own.Close
Recently Updated Extensions
Quickly generate mail filters on the fly, by dragging and dropping mails and analyzing their attributes. Create a filter in less than 10 seconds, it's as easy as: drag, click, click.
By popular demand, supports SORTING filters alphabetically.
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
Add-ons Manager - Version Number No Restart
Restores add-on version number inside Add-on Manager for latest builds of Firefox, Thunderbird and Seamonkey.
Instant access to the best websites related to the site you are browsing!
Connectify for Infusionsoft No Restart
Connectify.io is absolutely FREE simple to get started. The best part is this extension is the ease of use and remarkable idea of combining SMS with Infusionsoft directly in your browser. Search contacts, create tags, complete forms, and much more.
Display birthdays from the Thunderbird addressbooks as events in Lightning.
Element Hiding Helper for Adblock Plus No Restart
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.
Quickly test out your web pages in Internet Explorer, Chrome, Safari, or Opera. Open With opens the current page in your other browsers with just one click. Add Open With to your menus, toolbars and developer toolbox today!
Z-Sync to Thunderbird Addressbook
Will sync Thunderbird address book to Zentyal, Zarafa, Horde and outlook.com/hotmail.
View HTTP headers of a page and while browsing.
Live HTTP Header Fix By Danyial ITs Working On Firefox Again Fixed Reply Problem
This extension serves the purpose of providing instant access to the FOAAS web service. FOAAS (Fuck Off As A Service) provides a modern, RESTful, scalable solution to the common problem of telling people to fuck off.
SmartTemplate4 offers an easy way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every account as well as for the default (all email accounts). Also supports the Stationery Add-on.
uBlock Origin No Restart
Finally, an efficient blocker. Easy on CPU and memory.
FoxClocks No Restart
FoxClocks shows times around the world - or just your local time - at the bottom of your browser. It deals with daylight saving time so you don't have to.
UnMHT No Restart
UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.
Looks up the definition of words on a Web page.
Theme Font & Size Changer No Restart
Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.
Bluhell Firewall No Restart
Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.