Hi, in your list of add-ons, you have one that sounds like it could be affiliated with that site:

https://addons.mozilla.org/firefox/addon/invisiblehand/

You could try disabling or removing it and see whether that resolves the issue. You can view, disable, and often remove extensions on the Add-ons page. Either:

• Command+Shift+a (Windows: Ctrl+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Extensions. On the right side, find the "Manage Your Extensions" heading.

If there is at least one extension before the next heading -- "Recommended Extensions" -- please continue:

Then cast a critical eye over the list below that heading. Any extensions Firefox installs for built-in features are hidden from this page, so everything listed here is your choice (and your responsibility) to manage. You should see that one. While you're there, is there anything suspicious or that you just do not remember installing or why? If in doubt, disable (or remove). For your privacy and security, don't let mystery programs linger here.

Any improvement?

Thank you so much for responding and so quickly.

As mysteriously as the persistent cookies appeared it has now disappeared. Before I received your response I played with settings in History, changing it to use ‘Custom settings for history’, and resetting Cookies to ‘Delete cookies and site info when closing Firefox’ That last one didn’t seem to work. I also shut down my Imac and unplugged it for 10 minutes or more.

Now the cookie is gone. Following your suggestion, which I will keep, I went to https://addons.mozilla.org/firefox/addon/invisiblehand/ and now get the following message:

If you’ve followed a link from another site for an extension or theme, that item is no longer available. This could be because:

The developer removed it. Developers commonly do this because they no longer support the extension or theme, or have replaced it. Mozilla removed it. This can happen when issues are found during the review of the extension or theme, or the extension or theme has been abusing the terms and conditions for addons.mozilla.org. The developer has the opportunity to resolve the issues and make the add-on available again.

I am glad the problem is gone and that you took the time to assist.

Thank you.

Stewart

Hi Stewart, if an add-on is removed from the add-ons site, it might still linger on your system. You could check the Add-ons page (Command+Shift+A) when you find some time.

Using your suggestion, while I didn't find it under 'Add-ons, I did find it in 'Extensions' and removed it as noted below.

'Manage Your Extensions' InvisibleHand has been removed.