Problems with session

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Excuse me for my English, please.

My girlfriend worked in Mandriva 2009.1 and choose http://poshalim.info/?sort=video - porno site. The frame was appear "type a password". Epiphany was blocked when she try to close frame and Epiphany.
I tell her to fall down network connection and choose Tools - Administrate - System monitor - Processes - Epiphany (close the process).
Then she restart system and Epiphany worked normally again.
Can you tell how to prevent such problems without breaking a process - to make this solution easier?

I try to solve this problem in Ubuntu 9.02. A result was the same.