I have noted some differences on social network sites:

1. FaceBook
   
   IE. 6.0: Sorry, the new facebook is temporarily disabled. Chat unavailable.
   
   FireFox: Welcome to, the new facebook. Chat available.
   
   Opera:Welcome to, the new facebook. Chat unavailable.
2. LinkedIn
   
   This site Meta Search Engine and search resources: SurfToolbar.com is different on Opera and the other two browsers. Look at the Linked in message in the lower left corner. My comapany is registered in the LinkedIn database.
   
   Opera:
   
   0 people on LinkedIn work at (Code pasted from the page)
   
   MultiFinansIT
   See how you’re connected
   Access them in minutes
   
   Register or sign in »
   
   About LinkedIn »
   
   IE and FireFox:
   
   1 connection works at (Code pasted from the page)
   MultiFinansIT
   
   Kjell Bleivik
   
   
   See this connection »
   
   
3. When logging out from WPW, Opera ask:
   
   Stop executing scripts on this page? No such question on IE and FF.
4. Now my question is. Is this related to security issues, (default) browser configuration or other differences?

Any opinions?

Note: I use default settings in Opera (9.51) and FF (2.0.0.16)

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