Welcome to SeaMonkey Add-ons.
Add extra features and styles to make SeaMonkey your own.Close
YouTube High Definition No Restart
YouTube High Definition is a powerful tool that will let you automatically play all YouTube videos in HD (High Definition), turn off annotations, change video player size, auto stop videos, auto mute videos, control embedded videos and much more.
The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.
See new mail at a glance after automatic filtering - supports quickFilters addon!
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!
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.
Open With Photoshop No Restart
Open With Photoshop is a new companion for web and graphic designers to open up any web image with Adobe Photoshop via a single and quick mouse click.
Add more items to Add-ons Manager context menu.
YouTube Flash Video Player No Restart
YouTube Flash Video Player is a powerful tool that will let you choose Flash video player as default YouTube video player.
Google search link fix No Restart
This extension prevents Google and Yandex search pages from modifying search result links when you click them. This is useful when copying links but it also helps privacy by preventing the search engines from recording your clicks.
Old Default Image Style No Restart
Restores the default image style used for top-level images in previous versions of Firefox.
Copies text without formatting
Facebook Messenger No Restart
Facebook Messenger lets you bring a Facebook Messenger right into your browser to chat with your friends.
Reader No Restart
Reader is the ultimate Reader tool for Firefox.
Add "Go Parent Folder" menu to context menu in The Library list view and Search result in Bookmarks Sidebar.
Toolbar contains a set of functions, which expands the abilities of webmasters and optimizers, when working in the interface of SAPE exchange.
Private Tab No Restart
Adds private tabs.
Stylish Sync No Restart
Sync engine for Stylish with backup / restore facility.
Adds Firefox-style tab closers into SeaMonkey.
You are annoyed because your password fields are always scrambled though nobody else but you can see the screen? This most advanced unscrambling addon shows your passwords in readable letters, while being fully customizable to fit your needs.
Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey
Persistent sticky notes for Thunderbird associated to mails.
This is a port to Thunderbird >= 3 and Seamonkey >= 2 based on XNote 2.1.0 ( https://addons.mozilla.org/en-US/thunderbird/addon/3093 ) with bugfixes and additional features.