[ubuntu] Acer Aspire 4743 V1.13 wifi issues

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http://ubuntuforums.org – hi. network manager shows good connection when using wifi - speed at 70 - 100 Mb/s. i can ping google with results "time 13010ms rtt min/avg/max/mdev = 64.675/88.976/124.959/20.313 ms". however, chrome and firefox are having issues accessing sites, like google.com (connection time, page not available or takes a very long time to load). i'm not behind any proxy. the wlan adapter is an AR9287 Wireless Network Adapter (PCI-Express). the browsers are ok since i tried the same browsers using a wired connection. any help will be greatly appreciated. (Hardware)