This can be a very nifty function for anyone. By pressing "Ctrl + H" you will get this window:
As you see in the highlighted area you know got a window where you can go through the browser history, if you need to find an old URL maybe? The browsing history option gives you a variety of options. As you see the history is divided into different days, and you can go in and check each one of them.
As shown in the screenshot above, you can also in the "Find" field type in a search string and the browser will search the browser history for sites containing those keywords, below you can see I typed in "Mozilla", and the browser automatically generated a list over sites I've visited containing the word "Mozilla".
To the right of the search string field, you got a drop down menu where you can sort the sites as you wish, press it and check it out. :) "Ctrl+ H" is one of the nicest functions in Firefox. There are more, to be continued...
Introduction to Mozilla Firefox, part 1 (Installation)