Firefox may not be fully compatible with your security software. In particular, some "anti-keylogger" programs/features may modify the key codes sent to programs in a way that Firefox does not know how to decode.

In the past, I think ZoneAlarm was mentioned as one program with an anti-keylogger feature that has this incompatibility, but there might be others.

Ok, but can this problem be solved. Google Chrome gives the same problems.

Hitman-pro is running in the background. And I've got AVG-Zen running.

Hi roelinga, I am not familiar with Hitman-pro or AVG-Zen. Do either of them modify how the keyboard works with applications?

I don't know.

Opera operates normally. I always used Firefox as my standard browser, but since this problem, I changed to Opera.

But in some instances i'd like to use Firefox. Some addons don't work in Opera.

Unfortunately, I can't install either of those applications to test them. If you investigate their options/settings, do either mention anti-keylogger features and, if they do, could you try turning them off?

Ok. I'm trying to get in contact with the helpdesk of Surftight/Hitman Pro now because they have got a keylogger in their program. I don't see how I can shut the keylogger down.

Thanks for your expertise and time.

I'll be back.