Go back to those sites and find the web master or support there and ask if they support Smart TV browsers. Why we have to do that is noted at this link -> http://forums.cnet.com/7723-13973_102-571556/wh-samsung-smart-tv-web-browser-closed-uneexpectedly/?messageId=5354305&tag=rb_content;forums06#message5354305
The browser does have limits and the site must cater to Smart TVs if they want that audience.
I have been having problems with the Samsung Smart TV browser on live streaming sites such as Coolsport, VIP Box and First Row.
I've always had to mess about closing ads and stuff before the stream is operational but now the Samsung browser often freezes, particularly on Coolsports, when trying to open a stream from the Schedule page.
I usually have to exit the browser and sometimes even turn off the TV to regain control.
I have the latest TV firmware and have cleared all browsing data, turned on and off Adblocker, Popup blocker etc.
The same websites work perfectly on my laptop, using the same internet connection, so I assume it's the Samsung browser or server which is the problem.
These sites worked OK on the TV until recently so I'm wondering if Samsung is blocking them.