You already tested in Firefox's Safe Mode and that did not make any difference? Can you associate this problem with any software changes, such as upgrading from Firefox 31 to Firefox 32, or updating an add-on, or Windows, etc.? Have you noticed problems with any other dialogs or menus? ---- Occasionally a corrupted settings file may cause issues with dialogs. This file also stores toolbar customizations. You can rename the file and customize from scratch. Open your current Firefox settings (AKA Firefox profile) folder using either * "3-bar" menu button > "?" button > Troubleshooting Information * (menu bar) Help > Troubleshooting Information * type or paste about:support in the address bar and press Enter In the first table on the page, click the "Show Folder" button Leaving that window open, switch back to Firefox and Exit, either: * "3-bar" menu button > "power" button * (menu bar) File > Exit Pause while Firefox finishes its cleanup, then rename '''localstore.rdf''' to something like localstore.old Start Firefox back up again. Any improvement in the Edit Bookmarks dialog?