added tests for notimplemented error for double click in firefox
added tests for notimplemented error for double click in firefox

objarni/splinter,gjvis/splinter,underdogio/splinter,bmcculley/splinter,myself659/splinter,bmcculley/splinter,bubenkoff/splinter,underdogio/splinter,drptbl/splinter,nikolas/splinter,objarni/splinter,cobrateam/splinter,bmcculley/splinter,objarni/splinter,nikolas/splinter,lrowe/splinter,gjvis/splinter,drptbl/splinter,lrowe/splinter,cobrateam/splinter,underdogio/splinter,lrowe/splinter,drptbl/splinter,myself659/splinter,cobrateam/splinter,nikolas/splinter,gjvis/splinter,bubenkoff/splinter,myself659/splinter