DavidAR said

all the Website addresses I ever visited previously are listed. This happens even if I shut down and re-start Firefox, or if I re-boot the iPad. Why isn't this "Private" data not being erased?

It's not private data. It's all the Website addresses you ever visited previously in normal mode and they're accessible in the private mode (this is normal thing). But data from the private mode are not accessible in the normal mode.

Thank you for your response, I did not know that an address was not data!

If "private" has any meaning at all it must mean "inaccessible" to others. But it would seem to be splitting hairs to say that addresses are not data. Look at the definition of "Data": "Factual information, especially information organized for analysis or used to reason or make decisions." Not much ambiguity there. Any address is information; information that one might not want anyone else to have access to.

I would suggest that at the very least Mozilla should make this clear.

David

I have just tried private browsing on a PC. I entered an address, logged in, then logged out and and closed the window, When I opened a private window again that address was not remembered.

So it seems as though Firefox has different standards of "privacy", one for PCs, the other for IOS. Does this seem right? Or am I missing something?

David