Thank you so much. This may get me using Firefox again. I haven't used it for over a year because of the lack of a feature like this and a couple of others. I have been using Palemoon which supports the older extensions, but there are some other issues with it.
Not as powerful as "Add bookmark here" but light years ahead of what Firefox offers.
This should be built in. Other browsers have it built in. Konqueror, for one.
Come on Firefox. Time to move beyond 1997.