Is this true? I checked and I seemed to have lost my history from before 2012, and assumed I'd messed up somewhere in transitioning between computers. I couldn't find any info about Firefox doing this (arbitrarily deleting history from the past), but I'm almost sure it does.

Edit: This time I found it: https://wiki.mozilla.org/Firefox/Projects/Places_async_expir...

I find it rather annoying, however, that this isn't obvious. I like keeping all my history :( I'd rather I could at least keep the history somewhere, even if it didn't stay in Firefox's history view.