A possible workaround is this SQLite Viewer tool and open places.sqlite with the moz_keywords table.

Possible query to Execute:

• SELECT * FROM 'moz_keywords' ORDER BY keyword

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

(bug 1145063 - Remove the keywords column from the Library)

I'm familiar with two sites for querying SQLite databases (in this case, places.sqlite) the way cor-el suggested:

• https://inloop.github.io/sqlite-viewer/ -- working with the above query
• https://sqliteonline.com/ -- having trouble showing the keywords table??

If you want the list to show the url and title, try this query (after pasting in place of the default query, you have to click Execute):

SELECT keyword, url, ifnull(title, '---') as Title 
FROM moz_keywords INNER JOIN moz_places 
  ON moz_keywords.place_id = moz_places.id 
ORDER BY keyword, url