Browser.history expire days min
From MozillaZine Knowledge Base
Mozilla limits the number of entries in its browsing history. This helps performance by reducing the amount of information that must be kept in memory while the browser is running. To prevent culling old history entries prematurely, this preference allows users to set the minimum number of days of history to keep.
Possible values and their effects
A positive integer determining the minimum days of history to keep. Default is 90.
Mozilla Firefox 3
“Tools → Options → Privacy / History → Keep my history for at least ___ days”
Mozilla Firefox 3.5
Tools → Options → Privacy / History → Use custom settings for history → Remember my browsing history for at least ___ days”
“Edit → Preferences → Browser → History / Browsing History → Always remember visited pages for at least ___ days”
First checked in
Has an effect in