Bookmarklets are not dead. They may, however, be pining for the fjords.
Like Jeremy, I have a simple bookmarklet for saving links to my own site. My bookmarklet opens a new window/tab, passing via URL parameters the URL and title of the current window/tab to a page on my site. If I’ve highlighted some text in the page, the bookmarklet will grab that and insert it into the body field on my link form, prepended with a
> (the Markdown syntax for a
Not-so-humorously, that last piece doesn’t work on overly-clever sites like Medium that monkey about with browser-native user interface. Neutral face emoji.