There are many ways to access banned websites but i just recommend 3 ways which are listed as bellow.
1. The best way to access the banned websites is to buy a VPN service ! its best and secure way to access the banned websites and you can easily access banned websites using VPN (Virtual Private Network).
2. The another way to access the banned websites is using TOR, just download the TOR client and extract it anywhere and just open it and it will take 2 min to configure the virtual network and you can easily access blocked websites using it, there are also many tools available like ultrasurf and all but TOR is the best i recommend TOR.
3. You can find the proxy from the Google and configure it in the Mozilla Firefox but it will become more tough compared to above 2 ways and in the proxy configuration you have to check manually that whether the proxy works properly or not !
If you have any question about accessing banned website then feel free to ask !