IF NO IDEAS

1- Log on to your mac from the administrative account . 2- Open System Preferences .

 3- In the bottom row, under "System", select Accounts .      If you already have an account that you wish to block     website.     If don't have, create an account that not administrator     account. 4- Choose the account on the left then  5- Checkbox " Enable Parental Control " then 5- Click the "Open Parental Controls" button on the right .  6- Click "Web" tap 7- Click "Try to limit access to adult websites automatically" 8- Click "Customize" button 9- Click "+" button under "Never allow these websites" 10- Type website address want to block 11- Click "OK" 12- Close System Preferences

1 -  Open Internet Explorer 2- in the Menu bar click “Tools” → “Internet Options” → “Content”. 3- In the Content Advisor box, click “Enable”.

 4- Click the “Approved Sites” tab . 5- Enter the address of the website.

Keep in mind - if you want to block the complete website put an asterisk (*) in front. 6- Click Never and then OK.

 Click Never and then OK.
 
 7- Click on the “General” tab . 8- Make sure to select “ Users can see websites that have no ratings ” 9- Enter an easy-to-remember password . 10- Click OK to safely surf the Internet . 

1- Open Firefox, click "Tools" then "Add-ons." Click "Get Add-ons" and in "Search All Add-ons." Type "blocksite" in the search bar and hit "Enter." 2 - Click the "Install" button next to the entry for BlockSite. Allow the add-on to download (usually fewer than 5 seconds). Close “Firefox” 3- Open “ Firefox” again then go to "Tools," then "Add-ons," then click the BlockSite "Preferences" button after Firefox restarts. Make sure the "Blacklist" radio button is ticked, as well as "Enable BlockSite," "Enable warning messages" and "Enable link removal." 4- Check "Enable authentication," then enter a password if you would like to keep other users from deleting blocked websites or changing the settings in BlockSite without your permission. 5- Click the "Add" button, enter the URL of the website you would like to block, then c

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