Mozilla Composer can edit inline styles but not stylesheets. However, you may try CaScadeS, a CSS editor in development.
Mozilla Composer can publish individual Web pages via FTP, but it doesn’t have an integrated FTP/Web site manager.
Mozilla comes with DOM Inspector (for inspecting and editing DOM, e.g. HTML objects) and JavaScript Debugger (for interactive script debugging). Mozilla’s onscreen Help has more information on these.
You may also get many Web developer extensions.
NVu is a free Mozilla-based Web authoring tool. It includes DOM Inspector and JavaScript Debugger in addition to advanced features such as tabbed editing, integrated site manager, and rulers for table editing.