I have nine open tabs and suddenly, without warning, Firefox will open another nine tabs, duplicating the nine I have open and sometimes I see 2 sets of duplicates (27 open tabs) or more. What is going on and how do I prevent this?

My first open tab, my home page on my.yahoo, doesn't get duplicated, but all the others do.

If you click "Use current pages" then all currently open tabs become multiple home pages.
* https://support.mozilla.com/kb/How+to+set+the+home+page

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