If you have a mouse with some additional side buttons (that you don't already have mapped) I can strongly recommend mapping them to ctrl-pgup and ctrl-pgdn, so you can go left/right with your tabs in the current browser without having to relocate either your hands or your mouse pointer. Because I tend to open many links to new tabs (middle-click) - a consequence of living in a country (Australia) with poor internet speeds - I'm now lost whenever I have to use a mouse without those buttons.
Watching people use the mouse to go to the hamburger menu to recover a just-closed-tab, or to the tab bar to switch between tabs, or moving the mouse to the scrollbar to move the content up/down, is the contemporary equivalent of watching someone play Solitaire intentionally poorly.