Viewing the complete list of changes made for Firefox 40 I found this fixed Bug.

Deprecate old keywords API = in favor of a new API https://bugzilla.mozilla.org/show_bug.cgi?id=1140395

And this as an explanation - https://developer.mozilla.org/en-US/docs/Mozilla/Tech/Places/Using_the_Places_keywords_API - for why the change was made. Basically, "Note this is the same feature previously known as Bookmark keywords, the key difference is that keywords are not bound to a specific bookmark, but to a specific URL."

The keyword can still be viewed in Properties for a bookmark, accessed via context menu from the Navigation Toolbar button drop-down, the Bookmarks Sidebar, and the Menu Bar drop-down. Gone from the Library window.

Thanks, the-edmeister. I guess that answers my question. It's unfortunate that the keywords are no longer visible in the library as that is a good way to see all assigned keywords at once.

Maybe use the SQLite Manager extension with a query like this:

SELECT b.title AS Bookmark, p.title AS Folder, h.title AS "Parent Folder", f.url AS URL, k.keyword AS Keyword
FROM
(((moz_bookmarks AS b
 INNER JOIN moz_bookmarks AS p ON p.id = b.parent)
 INNER JOIN moz_bookmarks AS h ON p.parent = h.id)
 INNER JOIN moz_places AS f ON f.id = b.fk)
 INNER JOIN moz_keywords AS k ON k.place_id = b.fk
ORDER BY "Parent Folder",Folder, Keyword ASC

Hi cor-el,

thanks, your answer is really helpful and does what i want. Not as convenient as having the column there by default in the library but better than nothing.

Dave.