About three weeks ago, right before leaving on travel, I copied my key files (including places.sqlite) from my regular desktop computer's Firefox profile to Firefox Portable. Since then, saving bookmarks, passwords, etc. works fine, but I just now noticed that history is not being saved. If I go to All History, it lists January and months prior to that, but nothing in February (let alone things like Today, Last Week, etc.).
Wondering if places.sqlite was corrupted, I shut down Firefox, renamed the file, restarted Firefox, and did some browsing. FF generated a new places.sqlite, but I see nothing at all in History. The new places.sqlite file is 10MB, but I have no idea what is taking up all that space, because I don't see anything in the interface.