For the share issue we are already there, with Firefox+Linux so many websites started to just block, usually with chrome at least a captcha is still offered.

With the current board and directors and focus I don't see any ways Firefox will gain share in the future (or not any that I really care about), and I certainly have no interest to support the current goals ...

For the privacy part Mozilla has been sitting on features like containers for years with no improvements. At this point I believe Mozilla ending might be better since it would shake things up ...