I moved from FF to Chrome 2 or 3 months ago and will probably stay that way. With broadband everywhere I do not see speed difference but I am not a geek, too.
I can say the Omnibox is great, really. I thought it was making me nervous at first but now this is just great. Apart from omnibox there is really no difference for a regular user who does not use a million plugins.
Mozilla should get used to a thought they'll be a 10-20% player in the future and just get used to it.