That is a built-in Firefox container feature. Open a website in a container and then click on the container icon (right next to the search bar) to keep that site open in that container. Every other time, that site loads directly into that container
That was also the case for me (FF for Android), and I eventually found that I have WebGl disabled by default. Everything worked as expected after I resumed. FF animations run quite smoothly. Good work for developers.
Every galaxy we know of contains a massive black hole in the center. Until recently, the widely held belief was that massive black holes are formed via the process of mearging smaller black holes in large timeframes. However, once the JWST came online, astrophysicists discovered early massive black holes close to big bang that could not be explained by that cumulative process. There just was no time for the cumulative creation to a such large black holes.
So the current working hypothesis for massive black holes in galaxies is that they formed directly from the gravitational collapse of "vast clouds of gas and dust" with such high gravitational pressure that the core couldn't keep up, and the entire mass of gas and dust collapsed into a massive black hole. There is no supernova involvement; merely a direct transition into a black hole.
Of course, take my laic simplification into account.