IMO, lol. I could not right click on links in my bookmarks to delete, as I have in the past. Thanks to upgrades.
Because I bookmark links of articles for later reading, I sometimes have many extraneous links left on my Bookmarks list. So, here's how you delete and I would advise that you do it immediately after using the page you linked to, because it's a bitch to do later if you have several.
1. Click on the page you have bookmarked
2. Click on the "yellow star" that is near the refresh button
3. A dialog box will open. Click on "Remove this" and you're done
Sheesh! The right click/delete is so much easier. I don't know why they changed this. I've always had issues or gripes about Firefox bookmarks. It's awkward and not easy to navigate to do things like add a folder and such.