If your having troubles connecting to the internet in Firefox, your proxy settings maybe incorrect.
To check your settings, follow this guide.
- In Firefox, click on Tools –> Options.
- In the Advance section, click on the Network Tab
- Under Connection, click on settings
Most people’s connection settings should be set to Auto-Detect, but you can change them to fool other websites to think that you are located in another country.
For more information, you should read the follow posts I have written on MakeUseOf.com:
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How To Use a Fake IP Address & Mask Yourself Online
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6 Tips On How To Unblock A Web Page From Behind A Firewall