Hello, for the record, I use: Firefox 36.0 Mozilla Firefox for Ubuntu canonical - 1.0 As I said before, I did as suggested by Elfy and it now works great. I am running on AMD FX-8350, 64 bit. Gérald Le 2015-02-27 12:26, Hartmut Haase a écrit : > Hi Gérald, > it does not happen on i386. Which Firefox are you using?