Stored screenshot are a big and exceptions isn't sended to elastic

[rdpanek]

• 2.8M Jan 24 16:11 1453651899820.png

when missing access
EACCES, open '/xxx/1453651769777.png'
Error: [saveScreenshot("/xxx/1453651769777.png")] <=
EACCES, open '/xxx/1453651769777.png'

Sun, 24 Jan 2016 16:10:14 GMT uncaughtException: RuntimeError
     (UnknownError:13) An unknown server-side error occurred while processing the command.
     Problem: The FirefoxDriver cannot be used after quit() was called.
Build info: version: '2.48.2', revision: '41bccdd', time: '2015-10-09 19:59:12'
System info: host: 'd7c15f4430ff', ip: '172.17.0.32', os.name: 'Linux', os.arch: 'amd64', os.version: '3.13.0-24-generic', java.version: '1.8.0_45-internal'
Driver info: driver.version: FirefoxDriver

     Callstack:
     -> screenshot()
     -> saveScreenshot("/xxx/1453651814668.png")

undefined