Volume adjusts global system volume and not necessary for navigation, but I have it in most my profiles for non photo Windows apps :)
Buttons are self explanatory.
Scroll is mapped to vertical mouse scrolling and click is left for future (when it can be assigned independently) for scroll to top.
Switch tabs just switches tabs to the direction you turn a dial. Pressing it, refreshes the active tab.
History dial does what it says and pressing it reopens last closed tab.
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