PhantomJS: selenium.common.exceptions.StaleElementReferenceException: Message: {"errorMessage":"Element is no longer attached to the DOM","request":{"headers":{"Accept":"application/json","Accept-Encoding":"identity","Connection":"close","Content-Length":"203","Content-Type":"application/json;charset=UTF-8","Host":"127.0.0.1:57645","User-Agent":"Python-urllib/2.7"},"httpVersion":"1.1","method":"POST","post":"{\"sessionId\": \"9eb72070-16a3-11e5-aef6-dd718902453d\", \"args\": [{\"element-6066-11e4-a52e-4f735466cecf\": \":wdc:1434732775625\", \"ELEMENT\": \":wdc:1434732775625\"}], \"script\": \"arguments[0].scrollIntoView();\"}","url":"/execute","urlParsed":{"anchor":"","query":"","file":"execute","directory":"/","path":"/execute","relative":"/execute","port":"","host":"","password":"","user":"","userInfo":"","authority":"","protocol":"","source":"/execute","queryKey":{},"chunks":["execute"]},"urlOriginal":"/session/9eb72070-16a3-11e5-aef6-dd718902453d/execute"}}
Screenshot: available via screen

Chrome: selenium.common.exceptions.WebDriverException: Message: unknown error: chrome failed to start
  (Driver info: chromedriver=2.15.322448 (52179c1b310fec1797c81ea9a20326839860b7d3),platform=Windows NT 6.3 x86_64)

Firefox:
0
Results count: 10
10
Results count: 10
15
Results count: 15
20
Results count: 15
20
Results count: 15
20
Results count: 15
20
Results count: 15
20
Results count: 15
20
Results count: 15
20
Results count: 15