Consider this – you are sharing a computer at home, there aren’t any separate user logins and all family members use the same Firefox browser to surf the web. How do you make sure that people don’t get to know about the websites you visited last night?
In other words, how can you selectively clear such tracks from the Firefox browser without deleting the entire web browsing history?
Forget about this Site
This option is recommended if you want to erase only a couple of websites from your browser’s history.

Press Ctrl+H to access your web history in the Firefox sidebar, type some characters in the search box to find the website(s) that you want to remove, right click and select the "Forget About This Site" option as shown in the screenshot.
This option lets you delete either entire domains (like google.com) or even sub-domains (like images.google.com) from your browser history.
*If you like to selectively delete only a couple of web pages from the history (and not the entire website), just right click the web page title in the History box and select Delete This Page or hit the Del key on your keyboard.
Clear History from the Last Hour
Your family members have gone shopping and you therefore spent the last two hours browsing the 18+ web. Fine but how you do make sure that all the tracks are erased before the door bell rings.
Simple. Press Ctrl+Shift+Del in Firefox to open the "Clear Recent History" dialog and select "the last two hours" or "my history for today" option. This will delete only your recent Internet history while leaving the old data untouched so your wife will still quickly access all her previously visited sites from the address bar.
Browse Privately in Firefox
Now in situations where you don’t want to take the risk of deleting history, activate the private browsing mode in Firefox by typing about:privatebrowsing in the address bar (or choose Private Browser from the Tools menu).
This is the safest option because none of your web activities will be recorded anywhere. The private mode is turned off automatically as soon you close the browser window.

Find this article at: http://www.labnol.org/internet/clean-internet-history-in-firefox/7065/
Tags: Archives, delete, erase, firefox, Most Popular, privacy, Internet
Reader Comments
Thanks for the tips which helps to clean those overnite stuffs and not all the other history…
Written by Fasil on 02.05.09
You should note the fact that this entire post is only relevant to Firefox 3.1
Written by SteveW on 02.05.09
A nice way to keep the things secure. Private computer users can find it pretty handy.
Written by Vivek Kumar on 02.05.09
If you have less than Firefox 3.1, you can install the Stealther plugin which supports private sessions the same way as Private Browsing. Works very well.
Written by Don on 02.05.09
Testing on Firefox 3.0.5 Ubuntu Linux, this tutorial is not working.
Written by Kholid Fuadi on 02.05.09
I don’t see a “Forget about this site” option when right-clicking any site in my history. Using FF 3.0.6.
Written by alex on 02.06.09
Private browsing is a new feature in firefox and is only available for 3.1beta builds right now. Doesn’t work on firefox 3.0.
Written by Sharninder on 02.06.09
wait for the Private browsing, great!
Written by cnlogger on 02.08.09
You don’t need to wait for Firfox 3.1 to arrive to get your Private browsing mode going. You can do it with the current versions as well. Take a look at this link: link
Written by Shantanu Goel on 02.08.09