The End of Adobe Flash
I think everyone can agree that 2020 sucked. However, there was one bright spot on December 31, 2020. It was the end of Adobe Flash.
Made popular in the early days of the internet, Flash made moving graphics a mainstay for websites. Movie studio websites and online games took advantage of the software, but it quickly became apparent that Flash had a number of security holes. Constant patching by Adobe couldn't stop the eventual adaptation of HTML 5.
Goodbye, old friend.