Firefox crash while creating Adsense ads

Since two days i have a strange crash on firefox when i try to create new google das.
It's always the same point where it happens.
When i select the ad format, from the drop down menu, firefox shuts down, close, end of story. 
This happened 4 times now and always aexactly at the same point.
I'd like to know if anybody else is expiriencing this before i go to the Adsense forum with it.
Maybe it's my browser but that's up to date.

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Googlebot, nathan.joshua, Yahoo crawler