This is probably nothing but I am now super-suspicious with all the recent developments.
Firefox apparently tried update but wasn't able to and now wants me to do it manually by going to their site. There, they give instructions to go to Menu, Help, About Firefox, and then it would by itself start to check if it's up to date. It wouldn't do this before, I just checked again and now it is offering a link to restart Firefox to Update to version 52.0.2.
Ten minutes ago however when it didn't have this link following the above procedure I went back to Firefox and chose the manual download of their latest version. And what they offered there was 53.0.
Does this mean I skipped 52.0.2 and they are really up to 53.0? I checked yesterday and Firefox said my version was up to date.