I just performed a clean install of my Linux distribution's upgraded version. I signed in to Firefox account and started sync. While browsing my library, I found history items from my old Firefox profile. But what surprised me a lot was browsing history as old as 6 months..!! I know that Firefox Sync deletes history older than 2 months and Sync clients can't see it again. Also, Sync clients cannot upload data older than 30 days. So retention of 6 months of browsing history is not possible.
So, how was that happened ? Has Mozilla changed some policy to extend storage limit for history ?