Places.frecency.numCalcOnMigrate

Background

Firefox 3 introduced a number of improvements to the Location Bar. Among them were changes to how sites are ordered in the dropdown menu. Firefox takes into account how frequently and how recently sites in the browser history were visited, combining them into a statistic called “frecency.” The frecency of sites is calculated when the browser is idle. The way frecency is computed can be tweaked by a number of preferences.

When the browser needs to migrate history data from a pre-places version, it will calculate the frecency for a number of the imported visits to “prime the pump.” This preference determines how many of the imported entries to process during the migration.

Possible values and their effects

The number of imported history entries for which to calculate frecency. Default is 50.

First checked in

2008-01-29 by Dietrich Ayala

Has an effect in

• Firefox (nightly builds since 2008-01-29)

Related bugs

• Bug 414253 - do more frecency recalculations on idle, and / or do it faster than 60 seconds of idle

Related preferences

• places.frecency.numCalcOnIdle
• places.frecency.numVisits
• places.frecency.updateIdleTime
• places.frecency.*BucketCutoff
• places.frecency.*BucketWeight
• places.frecency.(visit type)VisitBonus
• places.frecency.unvisited(place type)Bonus

External links

• Places:Awesomebar (Mozilla Developer Center)
• Users:Mconnor/PlacesFrecency (MozillaWiki)
• Users:Sspitzer/GlobalFrecency (MozillaWiki)
• The Places frecency algorithm (Mozilla Developer Center)