Firefox sync with tags and knowing how to use the FF search bar to filter tags comes close for me
I didn't know we could search in the bookmarks from the address bar directly. It is indeed a nice feature. Here is the documentation for reference
https://support.mozilla.org/en-US/kb/address-bar-autocomplet...
More specifically in the section Changing results on the fly
I'm hoping (and optimistic) that the distributed web brings with it some epiphanies about how to do better local knowledge management!