Firefox – What exactly does the number listed under “places.history.expiration.transient_current_max_pages” represent in Firefox

about-configfirefox

The entry "places.history.expiration.transient_current_max_pages" in the Firefox about:config page is supposed to set the amount of time that Firefox remembers pages in it's history. However, the current default number I am seeing here is 84175. What on earth could this represent??? It can't be days, that would come out to 230 years! If it's hours then it's still 9.6 years, and if it's minutes, then it's 58 days, and that seems reasonable, but it's still an odd choice for the default length. If it's seconds it's only 23 hours and I KNOW that can't be right.

Best Answer

From the docs: https://developer.mozilla.org/en-US/docs/Mozilla/Tech/Places/Places_Expiration

places.history.expiration.max_pages: The maximum number of pages that may be retained in the database before starting to expire. Default value is calculated on startup and put into the places.history.expiration.transient_current_max_pages preference. This transient version of the preference is just mirroring the current value used by expiration, setting it won't have any effect.

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