Start your Computer in safe mode with networking. Then start Firefox. Try Safe websites. Is the problem still there?

Starting The Computer In Safe Mode;
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Hi KeithElmer, thanks for the list. This is the one mufngruf was saying you need to remove:

SafeSearch Incognito 0.1.8 true @safesearchincognito

Can you find that on the Add-ons page? Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Extensions. Then cast a critical eye over the list on the right side. See whether you can remove "SafeSearch Incognito" (look for a Remove button). If you do not find a Remove button, that usually indicates it was installed in a shared folder, and I can suggest a roundabout way to track down where that is.

Of course, all extensions are optional. If in doubt, disable.

Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.

Success?

By the way, please also check whether their program shows up in the Windows control panel, as described on their "Uninstall" page: http://searchincognito.online/uninstall

Many thanks it was the SafeSearch Incognito 0.1.8 true @safesearchincognito Removed from add on and normal service was resumed! Thanks again