I wanted to delete yesterday's FF browsing history, but I accidentally deleted the 'Yesterday' button under 'Show All History' instead. Yeah, stupid, I know. I tried Ctrl-Z, but that didn't work. I tried about:config but didn't see anything I thought I could use. Any suggestions would be appreciated, but I don't want to do a FF reset. Too much work to restore everything afterwards - extensions, settings, etc. Thanks.