function RewindPage()
	local titles, urls, index = km.GetMozillaSessionHistory()
	if not titles then return end
	titles = nil -- prune
	local host = string.match(urls[index], "[^/:]+://([^/]+).*")
	local i = index
	while i > 1 do
		i = i - 1
		if string.match(urls[i], "[^/:]+://([^/]+).*") ~= host then
			i = i + 1; break
		end
	end
	if i < index then
		km.GotoHistoryIndex(i - 1)
		-- Index of GetMozillaSessionHistory starts 1.
		-- Index of GotoHistoryIndex starts 0.
	end
end