The versions based on Gecko 1.7.12 don't have a sidebar.
There is a layers version based on a version of Hao with
layers, modified by me, still available, which has a sidebar
for bookmarks. From Mozilla 1.9a1 nightly of sept/2nd/2005.
But a warning first : Do not edit your bookmarks in the sidebar,
but open bookmarks edit from the menu bar or the bookmarks
button in the toolbar.
Download at :
http://rapidshare.de/files/5267452/K-MeleonCCF0.03RC2-modified.exe.html
Press the button "FREE" at the bottom of the page (javascript enabled) ,
and extract the self-extracting .exe into a fresh folder.
Fred