Internet crashing

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http://crunchbanglinux.org – OK so I'm new to Crunchbang, It seems that normal websites are fine however multimedia rich websites seem to just close, On firefox I would go to lets say the Simpsons to watch full episodes and then firefox would just close or i also tried msnbc news- it just closes- Any Ideas why? it loads youtube videos fine but it seems on other websites that have media on it it just closes, I also installed Opera and the same happens#! 9AMD Athlon64 3300 CPU512MB RAMSIS760 Graphics card (problem maybe?) (HowTos)