I kept loosing my tabs, then I discovered the "Lock" option, but that doesn't help; I'm still loosing them. FF 4 is fickle; and it's driving me to distraction!!!! Maybe I am not getting responses to my questions because so many people are asking posting complaints and asking why. These days I spend most of my time waiting for it to play catch up, as was a constantly resetting tabs that I've locked! I won't even mention the useless Sync feature! Are these issues being addressed or is FF going down the tubes? I have been giving serious thought to jumping ship, after years of satisfaction I have had nothing but months of frustration. I just don't get it.