Looks like it works properly that I can tell. I made a bit of a mod for myself (one added line).
I added an additional line to the "div.notifications-iframe.dropdown__menu" section to adjust the width and position of the panel. My line is "width: 40%; translate: 20%;", which makes the panel about double the width (to read the messages better) and then pushes it back to the right a bit (just for aesthetics more than anything).