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Thank you very much Schulte. Your fix worked perfectly. I would like to also post this fix on the Firefox support site, with your permission of course. Thanks again.

Thank you, Flood and Bernie, for your interst. First: as I mentioned in my message, I have tried setting browser to Firefox, then to internet explorer, then to Chrome. However as I said the problem persists. It seems to make no difference which browser I set to default. I have Kaspersky Internet Security 2019, I am not sure what you mean by ‘Protection-add-on version’.. I havn’t got a FF profile. I never have had. I have also posted a question about this problem on the FF support forum, the only advise was to check profiles, as mentioned in my original message. Up until the recent update to version 72 everything worked fine. No master password is used or set. Windows 10 Pro 64 bit.

After updating Firefox to v 72: Every time I try to access web from Kasperski Money Safe. with Firefox as default browser. Firefox tells me I am trying to use an older version of itself and to create a new profile. Which means all my bookmarks and history etc. are missing in the new profile. I have used about:profiles and found the old browser but it does not open into Money safe. Even when I set a new profile the same thing happens next time I attempt to access the web. I have reset browser default to other browsers but still Firefox persists in Kasperski Internet Security. Any help gratefully appreciated. Thanks