I had exact same experience. changed the registry settings in windows and am fine. Didn't have the nerves to find how to do on my mac and am just clicking discard every time. Annoying indeed. i wonder most of this shit is probably from the mozilla funding requirements to nerf the browser.

For eg. why tf would you put a separate scroll menu on tab right click to close tabs on left or right, it saves literally 1 row. and increases every single tab change to two clicks. UI disaster!!

i hope some group forks firefox and i will happily donate. But, due to current mozilla ceo siphoning money, not gonna donate a penny.