can no longer add, edit, tag, or remove bookmarks - when I click on the icon, no dropdown appears

When I click on the star icon in the address bar the star icon is filled in, and existing bookmarks show with the filled-in star icon. But I no longer get a dropdown where I can edit, tag, or delete an existing bookmark, and URLs I click on don't show up in Recently Bookmarked so they haven't been added. The places.sqlite file in my profile is not read-only, and I restarted Firefox (stupidly, before I took a screenshot of the pinned shortcuts on my new tabs page) and that made no difference. Thanks in advance for any help!