In general, I find that the toolbars at the top take too much space. I was excited about LessChrome but it did not work for me since the movement of the toolbar obstructed the reading space. OneLiner is much, much better. I do like the feature that the awesome bar changes its size when you access it, because sometimes I want to see the whole address to make sure that I am not on an illicit webpage. However, I can understand that some users find this distracting and would like have an option to switch this feature off.
The only improvement I could think of would probably quite difficult: At lest on the mac, the first line of the top toolbar section contains the 3 buttons (close, hide, increase window) and the title of the web page. The latter takes most of the space and is redundant as the title is also shown on the tabs (full name if you hover over them). So I would propose to drop the redundant title and to merge this line with the OneLiner toolbar. Of course, this should be an option as it would not be compatible with the UI-recommendations of the OS vendor.
In reply to other reviewers:
goso321: Full screen works perfectly with my OS (OSX 10.7). (Shortcut: shift-command-F)
Skittle LA: Customization works for me, though it is not very intuitive: I see the standard toolbars but not the OneLine toolbar. In order to add an icon to the OneLine toolbar you simply add it to the tabs toolbar.
Thanks for this great piece of work!