Actually, Chimera does have History support, it's just turned off in the defaults. To enable it, open the "prefs.js" file within the Navigator bunble (right click on the Navigator app, select "Show Package Contents", then proceed to navigate to the Resources folder, I believe (i'm not in front of my Mac right now, so I might have the path wrong), and locate the "prefs.js" file.
Open it in text edit. Search for the string that defines "History". It will be set to false. Change it to true. Save the file, relaunch Chimera, and now next to your Bookmarks tab in the sidebar, you should have a History tab.
If my directions are off a little, email me and I'll send you clearer directions when I get home...
Ciao!