Missing / deleted history - 'New and improved' releases add new features, improved (?) function, but eliminate some options and browsing history...

This has been a problem ever since updating from Firefox 8 to FF 10. I noticed that there was about a month missing from my history after that update. Checking my settings in 'about:config', there was no change in 'browser.history_expire_days_min' or 'browser.history_expire_days.mirror'. The value has been set at '720' ever since installing FF 3.6 over three years ago.
Admittedly, I don't install new updates the moment they become available... However, every time that I've installed an update, more and more of my history simply vanishes. Not a few days or weeks, mind you. but 3, 6, and even 9 months of history GONE!
I just don't understand why this option was eliminated from Privacy Preferences, forcing users to tinker with the settings in 'about:config' instead. Since users are given a warning before going on to the settings page, why would any programmer think this is a good alternative to the Preferences pane???
Now I'm down to history for February and March of this year... You can bet that I'm not going to be updating to any new releases for a very long time, if ever.
It seems that 'software bloat' isn't a 'Microsoft-only' disease...
New 'features' + 'improved' perfomance = New demands for disk space + improved glitches...
Frankly, I'm getting sick of this...

Not sure if it is relevant but the structure of the places.sqlite database changed recently, and jumping all the way from fx3.6 to fx18 or 19 could conceivably have been a factor. It is best to keep Firefox up-to-date.
Glad at least that you keep backups.
History backups are slightly problematic, because if the places.sqlite database is backed up and restored to an old copy the bookmarks then regress. As you will be aware already, Firefox itself makes no History backups, and has no facility to restore History only.

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