All I intend to say is that if I left when Mozilla thought it was a good idea to have an advertising company become involved in the development of their products and started tracking users without their consent (even if less invasively than cookies) with PPA, then surely I am not the only one who left.

This is a company that has previously sideloaded an extension into the browser without user permissions because of a marketing deal they made with a television show. As a result, I'm afraid im less concerned with the not-yet implemented features they may be working on or the features they have in place when there are a litany of other browsers available which don't fuck around with user permissions and privacy for advertising deals.

If I wanted a browser for tab grouping and UI stuff, I'd move to vivaldi, but at the moment firefox just doesn't seem to have the best UI or the best security and both of those are directly related to Mozilla's choices.

You are certainly entitled to your opinion and it is valid, but I think that my criticisms are also valid and are not baseless.