うえのをちょっと改良

require 'nkf'
require 'open-uri'

url =ARGV[0]
sec =ARGV[1]
if url == nil then puts "usage\n>#{$0} url [interval sec.]" ; exit; end
if sec ==nil then sec =10 end

brs="C:\\Program Files\\Mozilla Firefox\\firefox.exe"

html = NKF.nkf('-w', open(url).read)
ans =[]
html.split(/\n|</).map{ |data| 
  an = /\"((http|ftp)\S+)\"/.match(data)
  # match,1番目。[0]で全体
  if an != nil 
    ans << an[1] 
    print "."
  end
}
puts

ans.each {|address|
  puts address
  `#{brs} #{address}`
  sleep sec.to_i
}

linkopenall.rbで保存、実行例↓（途中でCtrl+C）

d:\ruby>linkopenall http://d.hatena.ne.jp 3
................................................................................
................................................................................
..
http://d.hatena.ne.jp/mobile
http://www.hatena.ne.jp/
d:/ruby/linkopenall.rb:26:in `sleep': Interrupt
        from d:/ruby/linkopenall.rb:26
        from d:/ruby/linkopenall.rb:23:in `each'
        from d:/ruby/linkopenall.rb:23
バッチ ジョブを終了しますか (Y/N)? y

d:\ruby>