I have a neighbor living above me, an about 80-year-old man, who needs help with his PC on a regular basis. One of the most regular cries for help is when Firef

I have a neighbor living above me, an about 80-year-old man, who needs help with his PC on a regular basis. One of the most regular cries for help is when Firefox changes its UI yet again, which seems to happen about every three months. This is deeply confusing for "normal" people just using their PC and also deeply infuriating for people like me who need to answer the whys of those changes. Looking at Chrome's main UI, it hasn't radically changed since the first version and we are currently on version 91. In Firefox' case, even running a LTS version does help in the long run, since you just postpone the pain. I just hope this endless tinkering with things that aren't broken ends someday -- users don't need an A/B-calculated productivity increase of 2%, come back when you can increase it by 200%. But in that case, just make another product and leave existing working ones alone.