MS (Edge C) Store extensions.

There are more extensions for Edge C, in the MS Store, then there were.  Someone here in the Forum was saying something about "Back to top"... there IS https://microsoftedge.microsoft.com/insider-addons/detail/dobeplcigkjlbajngcgnndecohjkjmia. And for something similar to Add notes there is https://microsoftedge.microsoft.com/insider-addons/detail/pnhgpmcklkbkaknlldokafinjabmfilo.; it is worth a look.

NB: I grabbed the Top button and since sometimes I mouse around whilst maybe not hands on the K/B for a bit, I'm, actually, finding it quite handy & likable, a number of times; just having the option of having it there is cool. (Hey, <-- that could be just a Drew thing, of course). I'm, always keen to discover things & try them, even if temporary.  If on keyboard there's, what?, 3 ways there, but, who's counting, eh?

Cheers,
Drew