Somehow that was not appearing my ff.
There was a + icon in customise that I had dragged to drop on menu -
tab bar. I used to click on that to open new tab.
Today, following your suggestion, I repeatedly dragged that same icon
to different locations on tab bar, and then it somehow got attached
after the last tab.
Now, I am getting that + New Tab at the end of tab bar. problem solved.
Thanks.
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Rawat