AppleScript to open a traditional new tab (with a New Tab page) in Arc browser. Bind this script to a shortcut key such as ⌘T or ⌘⇧T in tools like BetterTouchTool for Arc.

arc-traditional-new-tab.scpt

-- Can change this to your favorite new tab page extension URL, such as "chrome-extension://laookkfknpbbblfpciffpaejjkokdgca/dashboard.html"
set newTabPage to "chrome://new-tab-page/"

tell application "/Applications/Arc.app"
	activate
	-- tell front window to make new tab at after (get active tab) with properties {URL:"chrome://new-tab-page/"} -- not working
	open location newTabPage

	repeat
		set windowTitle to ""
		tell application "System Events"
			set frontApp to first application process whose frontmost is true
			set frontAppName to name of frontApp
			set windowTitle to "no window"
			tell process frontAppName
				if exists (1st window whose value of attribute "AXMain" is true) then
					tell (1st window whose value of attribute "AXMain" is true)
						set windowTitle to value of attribute "AXTitle"
					end tell
				end if
			end tell
		end tell
		if (windowTitle = "New Tab") then exit repeat
	end repeat
	
	tell application "System Events" to keystroke "o" using command down
end tell