Firefox sync

I scrollled back so far without any luck, so.....
I've got FirefoxPortable on my thumb drive
I've also got Firefox on my desktop machines.

What I'd like is a plugin or portable app or something that would let me sync bookmarks between both versions.

I supposed I could do the same job by syncing everything to a gmail account %|. However, this would require additional call cycles for Firefox to querie gmail, wait for a reply, etc, nevermind the overall bottlenecking that would go with it.

If this exists already, great. Otherwise, I'd love to see someone produce this.

Thanx.