A trouble with Mozilla or Firebox

[Bao Cao]

Dear All,

I am running FC3, just found every time when I use
Mozilla or Firebox to open www.webster.com, and
pronounce any word online which is one function of the
website, after heard the sound, all the webpages no
matter within the same window or not, even workplace,
just are closed without any notice. So I wonder, what
went wrong? Any way out of this? Thanks.

Best,
 BB Cao

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