I have one desktop computer with Vista/Ubuntu 12.04 dual-boot, and one netbook with XP. The netbook is usually far away from the desktop computer (i.e. rarely on the same network).
I would like to share Firefox browsing history and bookmarks across the different computers/operating systems. Similar to this Can I share same bookmarks db among Firefox installations in Ubuntu and Windows?, although multiple physical computers are involved.
Firefox Sync might seem like the obvious option, but I like to solve my problems without creating user accounts and subscribing to new services, if possible/reasonable (even if said services are free). The question is, is it possible to achieve this without Sync? Secondly, if possible, is it reasonable?
My first thought was to use Dropbox (which I already have set up on the two computers), and sync configuration files that way. I'm guessing that would require symlinking in Ubuntu. Could I then symlink similarly in the other operating systems? Would this mean trouble if I have different versions of Firefox involved? What if the two computers are running Firefox at the same time?