As with many others, I find myself cycling through two or three extensions of this sort, depending on how often YT's tweaks break things, and who updates when. This one is a reliable favorite, and one I will always come back to. In the mid-2020 YT update, it never completely stopped working, but even the gaps it had are now fixed, whereas the other extension I was using to cover the spots this one missed earlier in the year has now ceased working altogether. Amazing work, for a "one man" operation!