I know this seems like a dumb question, well he should know what he did to make that happen! The problem is I don't notice it when it occurs, it's after the fact when I look up ans see all those duplicate tabs open or come along and see that they are open after another person was on the computer. I think Alt Home shortcut would dup home tabs, but know not doing that. All Tabs duplicate themselves sometimes and I don't know why. It must be something I am doing, but haven't figured out what. Also, happens to wife and all she uses is Facebook. Example I normally have 6 tabs open, something is happening that all of a sudden I have 12 tabs open, they are always a duplicate of the 6 that were already open. Today when she was using FB, there was 18 tabs open, 3 of each. Does anyone have a clue to what stupid thing we must be doing to make that happen? Is there some special key combination that would make that happen? I am on FF 116.0.2, but this has been going on for a year or more, so not related to this release. Just something I must be doing or a combination of keys??