How to unblock website on Firefox
Open Firefox, Click "Tools" then "Add-ons",then Click "Extensions " Find “ Block Site ” then Click “Preferences". If have password Protect you need to remove “Blocksite” add-on by Click “Remove”. If not go to step 4. In “Blacklist” Click on the website that want to unblock then Click “Remove”. Or Click “ ClearList ” to unblock all. Then Click “ OK ”. Restart Firefox