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cmd+9 should take you to the last tab even if there are less than 9 open tabs (like Chrome)
Recently I had a lot of files open, and I would switch to the last one (with cmd+9) then edit it and close it, then switch to the last tab again. When I got down to less than 9 tabs left, I was very confused when cmd+9 no longer did anything.
Customer support service by UserEcho