A great replacement for OpenBook Rated 5 out of 5 stars
For years I used OpenBook to resize the bookmarks popup, but after updating to Firefox 13.0 it no longer worked, so I went looking for a replacement and found Edit Bookmark Plus. It works just fine. The popup is easy to resize and makes it so much easier to see all your bookmarks so you can put a new one in the most suitable folder. A really handy option is the ability to disable the popup autohide so the popup doesn't disappear when you unintentionally (or intentionally) click outside it, which is very annoying.
Why Mozilla hasn't built all this into Firefox is a mystery to me. The default popup is waaaay too small which makes it difficult to find a particular bookmarks folder. But luckily there are clever add-on makers like Kashif who can fix such problems. Thanks, Kashif!