The first Firefox add-on to optimize the SQLite databases that are used to store data like bookmarks or history was a Russian add-on that worked but did not please non-Russian speaking users. Vacuum Places Improved is a relative new add-on that features internationalization and additional options that make it a recommended add-on for users who want to optimize their Firefox databases to experience faster startups and better performance and response times.
The Firefox add-on basically offers two options to optimize the SQLite database. The first option will remind the Firefox user every x starts to clean the SQLite databases by displaying an icon in the Firefox status bar.

The second option, which is probably more comfortable to most users, is the option to clean the SQLite databases every x startups of the Firefox web browser. This means that the optimization will be run automatically. Both numbers can be changed in the options of the add-on to increase or decrease the number of startups that are required before the reminder or optimization takes place.
Vacuum Places Improved is compatible with Firefox 3.5 and later and can be downloaded from the official Mozilla Firefox website.
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With your first story Martin, a few days ago, about this add-on i installed version 1 later i found out ( not on Ghacks) that version 2 was out, so i installed it. I think its (ferry) strange that main (more than once daily) updates check did not find out that there was a newer ( version 2 and version 3) version. Does this version 3 now has the possibility to be found for updates, so when version 4 comes out there will be a automatic update?
This is a joke, these tricks exists for years, they do NO-THING.
I liked the second option. Thanks
Firefox does this automatically now, no need for 3rd party extensions.