Maybe you can think back to what you were searching for, or think about what led you to the site in the first place? Since you did a 'clean' after the computer froze it may not be in the computer's history but maybe you can 'replay' your thought process and it will be in your brain's history. Does that make sense? Kind of like when you walk into a room and forget what you were looking for so you go back to the room you just left.