The idea and implementation of the interface is fantastic. Very thoughtful.
I've feeling that some history in last week either missing or have incorrect timezone. Not sure yet. I'll blame the Firefox synchronization feature for now.

One of my favorite addons out there! Improved History makes it much easier to look back at your history due to its well organized menus and its extremely simple UI. Thank you!

Been using similar in Google Chrome for a while, switched back to FF and glad to have found this. Very useful to me to see date and time to find lost links. Thanks.