If one wants to view Adobe Flash content, then download the .swf file and play it locally on your system. AmigaOS4 has
Gnash, but I don't have AmigaOS4.
I would recommend
Flash Player 1.4/1.6 by Maxim Ilyn from 2008, but I've tried the program and it is less than ideal. You don't get play/pause/rewind or any controls like that, the .swf just autoplays. I tested two or three .swf files when I tried Maxim's program, however long ago that was, and, if I recall correctly, autoloop is not even an option. Audio continues playing, but the video stops and doesn't loop, so that's a bummer.
There's one other option that I have yet to try, and that's
swfplayer 1.4b6, hosted on Aminet. It's from 2005 and compiled for 68k AmigaOS3, so it should work fine on MorphOS, but the developer prefaces that the software is in beta, so it has kinks. I do not know if using it is a worse experience than using the newer Flash Player 1.4/1.6 by Maxim Ilyn.
Mac Mini G4 1.5 Ghz, ATI Radeon 9200 64MB, 1GB RAM