I want to set Firefox so that it deletes all the previous websites I have visited every time I exit Firefox I have tried numerous times to do this but it fails to deleted the websites.
What am I doing wrong as I sign back into Firefox it still displays the previous websotes visited on the drop down

Click tools, options then the privacy tab
-set keep my history for at least: 0
-Put check in box - Always clear my private data when I close Firefox

I have tried this many times but it is not deleting the regular websites that are visited it still shwows the most visitied website on the drop down screen

Well, here is a free app that can do this, just have to click shortcut when you logoff and that should do it

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I am not an expert... but with Firefox are you using a home page that is for example "Google?" And is this drop down from the Google page, I am having the same problem.

What I am actually trying to do is delete the last visitied websites on the url bar

Found this

How do I delete address bar history in Firefox?
To delete address bar history in Firefox 2.0:
• Select "Tools"
• Select "Options".
• Select "Privacy".
• In Private area click "Clear Now".
• In "Clear Private Data" window put the check mark for "Browsing history" and click "Clear Private Data Now".
• Click OK.


And this

Delete single URL address from the Auto Complete feature by typing the beginning of the domain name in the Address Bar. Highlight the address with either an arrow key or your mouse and clicking "Shift" and "Delete" on your keyboard. The address should disappear from Firefox's Auto Complete function.
Step2
Remove drop-down lists of address bar history by selecting "Tools" from the browser's menu and choosing "Clear Private Data." Make sure that "Browsing History" is checked before pressing "Clear Private Data Now."
Step3
Disable history to ensure that Address Bar History won't show up again. Go to "Tools" and "Options" in your browser's menu. Locate the "Remember visited pages for the last…days" field and change the number to "0" before clicking "OK" to save your changes. This configuration ensures that your browser won't remember what websites you visit and the addresses won't show on your Address Bar's History on the drop-down menu.

Hope this helps out