You could add a line of code to put into a ''userChrome.css'' file to change the height and width of the panel opened. This is the code: <code><nowiki> #editBookmarkPanel { min-width: 500px !important;min-height: 500px !important;}</nowiki></code> For an example of how and where to create that file, see [/questions/1178010 this question] for instance, or refer to [https://www.userchrome.org/how-create-userchrome-css.html this page]. Another option (probably easier) that also adds some features and therefor may be useful for you is to install the [https://addons.mozilla.org/firefox/addon/edit-bookmark-plus/ Edit Bookmark Plus] add-on. This add-on does not seem to be compatible with Firefox Quantum (57+), but you seem to be using 47, probably for a good reason. If hardware or add-ons are the reason for that, you are advised to [[Switch to Firefox Extended Support Release (ESR) for personal use|switch to Firefox 52 ESR]]. See [http://forums.mozillazine.org/viewtopic.php?f=38&t=2425679 this mozillaZine thread] for more info.

Note that you can set click in the tree area to set focus to this area. You can do a search by (very) quickly typing the first letters of a folder to jump to this folder. This works with all treechildren type areas like the bookmarks sidebar or left panel in the Bookmarks Manager (Library).