The Master 3 mouse thumb scroll wheel use to work well scrolling between tabs in Safari however it now seems to have stopped working. When you set the mouse to 'Navigate between tabs' all it seems to do is send <tab> whichever way you scroll which results in various elements of the window and page getting highlighted in turn. The correct keystroke for moving between tabs is <^Cmd+Tab> and <^Cmd+^Shift+Tab>. Unfortunately I can't set that set of keystrokes up in Logi Options because it doesn't recognise <Tab>, only <^Cmd> and <^Shift>. It's kind of annoying.