Have way too many tabs open 20- 30. On tab 27. (near the right end of the tab bar) Move mouse to switch tabs. Before the preview thumbnail appears the tab bar scrolls to the left, selects a random tab and changes focus to that tab. example. Have a bunch of tabs open looking for a new vacuum cleaner, makers web sites and views. Get a call from my mother-in law, problem with her computer. Have bunch of pages open, stackoverflow, reddit etc. Find a solution that looks similar to a page on a previous tab. Move mouse over a tab and before the preview thumbnail appears the tab bar scroll to the left changes focus to a vacuum cleans manufacture page. Its not jumping to a duplicate of a page. I have no idea if its jumping back 10 tabs or 15 tabs. It never jumps to the first tab. I don't have my hands on the keyboard. Not touching the mouse scroll wheel. Help!!!!