The fact that it got killed is literally an example of software being worse now than 10 years ago, thousands of fantastic little games were implemented in Flash, this was an easy way to create and distribute games causing many little labors of love being made, and then the deliberate choice was made to kill it.
Fortunately the ruffle project revived many of those games now.
True... but also when your right clicked in a Flash widget on Firefox on Linux in would cause the browser to hang. This problem existed for years. That is why I listed it.
I used flash in firefox in linux all the time and used right click often to pause flash animations and skip frames forward/backward and this never crashed/hung for me, so at least it wasn't a general linux issue...
The only annoying thing was that there was a time period of multiple years where the linux flashplayer was not being updated anymore and more and more Newgrounds games started not working for Linux, then at some point adobe finally turned around and made linux versions again... (maybe it was between 2012 and 2016 with versions 11 to 24 but somehow my memory was that this was longer ago)