The below applied to my computer. Ubuntu 10.10, Minefield 4.0pre10 2011-01-18:

Get the following extensions:
Adblock+
Download Status Bar
Link Target Display
Omnibar
Rss Icon
Stylish
Scriptish
Personal Menu 4.3.2 (Not the newest version. It's a POS that only works with the appmenu BS) Don't forget to disable updating
Hidemenubar (Only needed for linux?)
Barlesque (There are several stylish extension that doe this too, but barlesque works w/o fiddling
Right click on the tab-bar background and select customize
- Remove the search bar and the spacer for it.
- Select "Use Small Icons"
- Put the following in your 'navigation toolbar': Personal Menu, PM-Bookmark Icon, PM-History Icon, Back/Forward button (Will fix below), URL Bar, Reload, Stop
Right click tab-toolbar and uncheck "Menu Bar" and "Bookmarks Toolbar". Check "Addon-Bar"
Either make a Stylish style with
@-moz-document url-prefix('chrome://')
or a userStyle.css
Add the following rules. (YMMV I use Ubuntu)
#forward-button,
#back-forward-dropmarker,
#star-button,
#context-openlinkintab,
#context-sep-open,
#context-bookmarklink,
#context-sendlink,
#context-viewimageinfo,
#context-sendimage,
#context-setWallpaper,
#context-setDesktopBackground,
#context-back,
#context-forward,
#context-reload,
#context-stop,
#context sep-stop,
#context-bookmarkpage,
#context-savepage,
#context-sendpage,
#context-sep-viewbgimage,
#context-viewinfo,
#context-metadata,
#context-sep-bidi,
#context-bidi-text-direction-toggle,
#context-bidi-page-direction-toggle,
#menu_bookmarkThisPage,
#subscribeToPageMenuitem,
#menu_bookmarkAllTabs,
#subscribeToPageMenuitem,
#liveclick-options-menu,
#bookmarksToolbarFolderMenu,
#bookmarksToolbarFolderMenu + menuseparator
{ display:none !important }
.tabbrowser-tab:not([pinned])[fadein]
{
max-width: 200px !important;
min-width: 200px !important;
}
.tab-close-button { display: -moz-box !important; }
#appmenu-toolbar-button { display: none !important }!