hello, could you provide your latest few submitted crash reports? please enter about:crashes into the location bar, copy the latest few report ids from there starting with bp- & paste them here into a forum reply. this will give us a better understanding what may be triggering those crashes. thank you!

hello, thank you for replay id: bp-cd789a7b-32a1-4610-b01e-d1a932150316

hi again, can you try if the issue is still reproducible when you download and install firefox 37 beta 6 from this link: ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/37.0b6/win32/

great. thanks philipp. until now it's realy is Ok. thanks again.