Mozilla Firebox is relatively easy to set up to block or unblock sites through its 3rd party Plugin installation. BlockSite is an optional add-on that automatically blocks websites of choice. This extension should not be used for parental control or access control purposes, when you consider that is not really safe and can just as incapable or off.
Steps To Block Harmful/Unwanted Website Using BlockSite Plugin -
1. Load Mozila, click “Tools” > “Add-ons” > “Get Add-ons” > “Browse All Add-ons.” Type “blocksite” in the search bar after the Mozilla add-ons website opens and press “Enter.”
2. Click “Add to Firefox” icon next to the entry for BlockSite. Allow this add-on to load, then click the “Install Now” icon. Restart Mozilla when asked for.
3. Go to “Tools” > “Add-ons” > click the BlockSite “Preferences” button after Firefox restarts. Make sure the “Blacklist” button is ticked, as well as “Enable BlockSite,” “Enable warning messages” and “Enable link removal”.
4. Check “Enable authentication,” and enter a new password if you would prevent other users from deleting blocked websites in BlockSite without your permission.
5. Click the “Add” icon, enter the URL of blocking websites, then click “OK.” Repeat same to add more blocking website URLs, or click the “Clear” button to clear the list. Once its done, click “OK” and restart Firefox.
Link To – BlockSite Plugin


