A web browser for MacOS 10.7 - 14.1 & Linux.

Built upon the unified XUL platform.

What features are included

• Tabbed Browsing
• Comprehensive control of Preferences
• Customizable Toolbars
• XUL Overlay and Bootstrap Extension Support
• SeaMonkey Theme Support
• Supports Plug-ins
• Supports the JXL image format
• Supports Flash
• Supports 'dark mode' on supported sites (set via preferences pane)
• Ability to switch profiles
• Multiple Search Engine Providers built in
• Built upon a mature and secure code base
• Privacy respecting. Doesn't 'phone home' like many 'popular' browsers do

What is not included

• Digital Rights Management (DRM) such as Encrypted Media Extensions (EME)
• WebRTC
• WebExtensions
• Developer tools (some functionality can be added back via an extension)
• Lightweight Themes/Toolbar Backgrounds
• Language Packs (English only)
• MS Windows support

Available Extensions for SeaLion

• adblock latitude - ad blocker

• bbcodextra - adds custom tag commands to context menu

• bluehell firewall - ad blocker

• chatzilla - irc client

• cookies exterminator - auto deletes cookies

• copy as plain text - copies text w/out formatting

• dom inspector - inspects the structure and properties of a window

• dorando keyconfig - rebind your keys

• download status bar - powerful download manager

• down them all - media downloader

• email this - adds context menu to 'email this'

• ematrix - port of umatrix that blocks scripts, ads, etc

• fireftp - ftp client

• fireshot - take screen shots of web pages

• greasemonkey - user script manager

• hit a hint - open links with keyboard shortcuts

• https always - encrypt the web

• menu wizard - customize your browsers menus

• modhresponse - rewrite http response

• mouse gestures suite - scroll wheel navigation, page scrolling, tab scrolling

• multiple tab handler - manage your tabs

• nicereader - similar to readerview

• overbiteff - enables the gopher protocol

• page navigation buttons - adds a few buttons to help with page navigation

• palefill - injects polyfills for various web technologies

• pdf-js - html5 pdf reader

• private tab - opens a private browsing tab

• quicknote - notes extension with advanced features

• quick passwords - quickly login and get passwords

• seatab - adds a close button to each tab

• secret-agent - enhances the privacy of your web surfing

• swarth - psuedo dark mode extension

• tab clicking options - assign tab related actions to clicking events

• torrent tornado - torrent client

• uBlock0rigin - ad blocker

• user agent switcher - self explanitory

• web developer - adds some extra easy to access functions

• website navigation bar - reintroduces SeaMonkeys navigation bar

• world ip - geo add-on with security features and advanced network tools

• All the extensions listed above are found in the SeaLion-Extras.zip

Available Extra Themes for SeaLion

• kilome
• modern2
• orthodox
• pinball
• littlemonkey
• gnomerunner (linux only)

You can also drag your extension icons to the component bar (lower left) instead of having them on the tool bar for a cleaner look.

GnomeRunner Linux theme - Uses GTK theme style and icons

The 'default theme' even though on first start it will use Gray Modern by default

PowerPC Linux build is compatible with 32-bit Debian 12 / Fienix 6 / MintPPC