Just got a new laptop with Vista installed. Choose Firefox as my browser, but it won't let me play videos or download plugins. Videos work just fine on IE. What's up with that ?

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K