I had this same problem on Windows XP and I just switched to Linux Ubuntu but the internet still doesn't work. Windows is completely removed. I still use a Motorola SB5101 Surfboard cable modem. The same modem works fine on my laptop with both windows vista and ubuntu...?
Error: [Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) nsIChannel.contentType" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame
file:///usr/lib/xulrunner-1.9.0.8/comp...
FP_onstartRequest :: line 1440" data: no]
Line 1440 says: channel.contentType = "application/vnd.mozilla.maybe.feed";