When I'm browsing, especially when shopping, say, Amazon, eBay, or Swanson Vitamins or wherever, FF opens a new tab which remains open to the right of the left-most original tab. Of course, when I + a new tab which I want it to stay open, it opens and, again, by itself, FF closes the first tab and the latter takes over the left-most spot. And, in case of eBay, when I click on an item I want to check, it keeps on opening a new tab on the original tab. Placing the cursor on FF icon on task bar displays all the tabs. I never had things like above happen with previous issue FF. Of, course, I don't know since which FF version was stable in the way I wanted. Does anyone know how to set FF to stop taking all these unwanted actions?