Hi - I've fixed this and uploaded a replacement video with less loud beeps. Sorry about that.
I can't play the video at all in firefox desktop because the video is encoded as h265 which firefox won't play unless specific extensions are installed.
h264 is the better choice for short progressive download clips on websites if compatibility matters.
huh. plays fine for me in firefox stable on linux, and with no extensions in firefox. Do you mean OS extensions?