Thank you for your quick reply, tparker. no, I don't need it quickly, but I need it to run some firefox plugins. I have tried chrome, but it also didn't work (installed properly, but nothing happen when I try to start it. However when I check process manager it seems still running in backend) I also tried flock and Mozilla x86-64, and none of them work. Also embebbed Internet Explorer doesn't work for me. I even re-install gecko manually.