REMOVED:
Small icons mode for toolbar buttons
Text-only mode for toolbar buttons
Icons-and-text mode for toolbar buttons
Addons toolbar
Custom toolbars
Bookmarks / History sidebar buttons
Firefox menu button
Separators / Spaces / Flexible Spaces
Activity Indicator (Throbber)
LOCKED:
Back/Forward/Urlbar/Stop/Reload locked into group on the Navigator toolbar
New Menu button locked onto end of Navigator toolbar
All tabs button locked onto end of Tabs toolbar
Cut / Copy / Paste locked into movable group
Tabs toolbar locked on top and always visible
Navigator toolbar locked as always visible
Yeah right. All about customization….