Hmm, I find it odd that you want cross-noise in your autocompletes. I use the things for doing personal browsing on work machines and find them very convenient.

But on Firefox it seems totally unusable because of near misses in UI. I haven't found a nice menu for switching between profiles, or a way of getting a list of available profiles short of rooting about in my settings. The default profile is can change itself in strange, and will only sometime coincide with the profile called "default".