Hi, I see you have a plug-in called 'Content Blocker Extension.' It's possible that is causing trouble so disable it to test - Add-ons Manager (Ctrl+Shift+A) > Plugins. If that isn't the cause, delete all references to Google, as shown under the heading 'How do I remove a single website from my history?' in this article - [[Delete browsing, search and download history on Firefox]], then try the sites (not from old bookmarks) again. if none of the above helps, please tell us the exact error message. ''If your question is resolved by this or another answer, please take a minute to let us know. Thank you!''