vco1

Thanks for all your help and investigations. Much appreciated. I did some additional testing too, and it turns out that if I copy a password from SafeInCloud it doesn't get stored in the clipboard history (so that option in Alfred seems to work as expected). But as soon as I paste it in Firefox it does. This behaviour disappears though if I disable the SafeInCloud Firefox add-on/extension. So even if I don't use the Firefox extension but simply copy and paste, it still has an impact on the clipboard history. Perhaps that's in line with your findings. I'm not too familia

Although I like to keep these separate, I've updated my email address.

Yes and no. I do have the Firefox extension installed. But the behavior I'm describing happens when I copy a password directly from SafeInCloud and paste it into Firefox. So the copy is initiated from the application that's in the exclusion list for the clipboard history.

I have added my password manager of choice - SafeInCloud Password Manager - to the Ignore Apps list for clipboard history in Alfred. However, passwords and other data copied from SafeInCloud are still visible in the Alfred clipboard history. Strangely enough with a Firefox icon. Am I missing something? Or is SafeInCloud Password Manager not using standard macOS calls for the clipboard?