Cleanup your computer and internet activity!
Delete Mozilla Firefox Autocomplete Data
Mozilla Firefox tries to be very helpful as you browse the web by keeping track of where you've been. You can hit the Back button to revisit pages you've viewed in the current session, or you can use the history window to go back to pages from days or even weeks ago. And when you start typing a URL into the address bar, it shows you a list of places you've been that match what you've typed so far.
If you've done a lot of browsing that last one can be a huge list. Perhaps even too huge to actually be helpful.
When you type a URL into the address box Firefox suggestions come from several locations: your History, your Favorites, recently typed entries, or the contents of a folder if you are specifying a path on your local machine.
While the AutoComplete feature may be helpful for some things, it can also seriously compromise your security and privacy, because anyone who has access to your computer can see what web sites you visited and what information you entered on web pages. Also various malicous software can use AutoComplete data to steal your personal information such as your name, e-mail address, credit card information and/or retrieve web sites passwords stored as autocomplete data.
So anyone who has access to your computer can see a drop down list with information you've typed.
You can use Easy SystemCleaner to Delete your Firefox AutoComplete Data.