Change in Instagram story behaviour after Mozilla upgrade

After one of the late 9x.0 upgrades to Mozilla the display of stories on Instragram changed. Prior to that upgrade if I clicked on the pause button
Screenshot 2023-01-21 at 10.21.54
giving me
Screenshot 2023-01-21 at 10.23.20
and it stayed paused until all the current stories had been displayed. But now seemingly randomly after I click the pause button it flips back. Sometimes this flip happens with the next story and other times it will be after dozens. It is annoying and distracting as I need time to read or assimmilate what is in stories; I’m dyslexic and read very slowly.

I have not changed any Firefox config settings related to videos/autoplay/autostart/etc for several years. But that 9x upgrade fiddled with something and I want it fiddled off.

This problem has worsened! Now Instagram are forcing auto start on videos in stories!