Not a large deal but thought I'd bring it to attention. Noticed it long ago but thought maybe related to Firefox and an extension/plug-in specific to my use. I normally have Scroll Highlighting unchecked anyway. Am using someone else's laptop with MS Edge at the moment and the bug does exhibit.
Use Scroll Highlighting enabled, a Wash/Rinse/Spin button clicked via ctrl-click to open in new tab, the target link opens in *both* the parent tab and a new tab. Right-click and Open in New Tab works properly, opening the link in only the new tab. The slight irritation (LOL) comes from the convenience of ctrl-click vs. right-click and having to focus the mouse on the Open in New Tab option on the context menu and clicking again.
Use Scroll Highlighting disabled, ctrl-click opens the target link properly in only a new tab.