How to Block the Websites

1. Open Firefox and click on the "Tools" menu. Select "Add-ons" and then click "Get Add-ons."
   
   
   
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   Type "BlockSite" into the search bar and hit "Enter." Click on "Add to Firefox," "Accept and Install," and then "Install Now." If you get a message saying that Firefox needs to restart, click on the "Restart Firefox" tab, or close your browser window and then launch the browser again.
   
   
   
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   Go back to the "Tools" menu once your Firefox browser restarts. Then click on "Add-ons" and find BlockSite in your list of Add-ons. Click on the "Options" button.
   
   
   
4. 4
   Make sure the boxes "Enable BlockSite," "Enable warning messages," and "Enable link removal" are all checked under the "Enable functions" heading. Click the radio button next to "Blacklist."
   
   
   
5. 5
   Click the add button, type or copy the URL of the website you would like to block in the text box, and click "OK."
   
   
   
6. 6
   Put a checkbox in the "Enable authentication" box and type in a password if you would like the use of the BlockSite add-on to be password protected. This will make it so users will need to enter the password in order to add, edit or remove websites from the list of blocked websites.