Unable to download firefox browser and unable to open webpages normally ??

I am a new Macbook user, I just got a new Air, I am having trouble downloading Firefox, I tried downloading the file from the download section however, I was unable to open the webpage and recieved the following error:
afari can’t open the page “http://wsidecar.apple.com/cgi-bin/nph-reg3rdpty2.pl/product=03699&cat=11&platfor m=osx&method=sa/download.html?product=firefox-3.5.1&os=osx&lang=en-US” because it can’t find the server “wsidecar.apple.com”.
Also, I am unable to open certain webpages like facebook and youtube properly. Do i need to installl any plug ins? or anything else ?
Thank you

Hi Manu,
The best way to download Firefox would be through the official source at http://www.getfirefox.com. When it finishes downloading, drag the Firefox icon to your Applications folder, and then "eject" the disk image.
Regarding other sites, you may be having trouble due to not having the Flash plugin installed. You can download it at http://get.adobe.com/flashplayer/
Hope this helps.

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