If I want to sync firefox bookmarks only one direction, do I have to check "enable bookmark sync" on both machines? Both are running 11.04 and firefox 6.01. How about both directions?
If you don't enable bookmark sync on a machine, then it will only use the local bookmark store.
So if you want to share bookmarks between two systems, both must enable bookmark synchronisation. Unfortunately, I don't think any of the Firefox bookmark synchronisation systems support one-way synchronisation, so this will give you two way sync.