Please Note:
This tutorial was created for Firefox 3.6
It may not be applicable for earlier versions.
Step 1
Select "Options" from the "Tools" menu.
Step 2
Select "Privacy"
Step 3
Select "Use custom settings for history" from the drop-down menu.
Step 4
Click the "Clear history when Firefox closes" Check box.
Step 5
Click on the "Settings" button.
Step 6
Choose your desired options.
Various add-ons may add options to this window.
In this example, "Tab Mix Plus" and "DownThemAll" have Check boxes.
Step 7
Click on the "OK" button ("Settings for Clearing History" window)
Step 8
Click on the "OK" button ("Options" window)
Firefox should now auto-cleanup (your chosen options) when you close it. :D
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