finally made an account just to write this, 100% recommend this extension! I tried it after reaching my breaking point of frustration with Youtube in general, and it's been absolutely wonderful. I was astonished when I turned the extension on for the first time and watched how fast it buffered, ever since I was little I thought buffering was simply perpetually locked at that snail speed youtube normally forces on you. Having it all buffer in one go is so much nicer on my sad potato of a PC. So far my only hurdles are that I would love to use the audio menu, but it's a little too overwhelming for me and I don't really know what to do with it; and that it makes using theatre mode on youtube a bit difficult. It's the way I watch all youtube videos, as it's almost fullscreen but without being too overstimulating, and allowing me to escape to the comments if a phobia comes up or there's just too much going on, but there's not a theatre mode option in the FastStream player UI, and I can't access the youtube player ui or use its hotkeys (as far as I'm aware, but I am a bit dumb), so it's a bit janky getting it to work when youtube just decides every now and then that it wants to go back to standard viewing mode. But that's just for a specific website, and this extension is still being developed and cared for. so please if you come across this in the extension store, give it a try! <3
P.S. sorry for the ramblings, my mental issues can make it a bit hard for me to come across clearly or in an organized manner