Created attachment 8918863 [details] bookmarks.webm Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0 Build ID 20171015220106 [Affected Platforms]: Windows 7 x64, Windows 10 x64, Mac OS X 10.12 [Affected platforms]: Nightly 58.0a1, Firefox Release 56.0 [Steps to reproduce]; 1. Launch Nightly 58.0a1 2. Enable the Menu Bar 3. Open Bookmarks and create a new folder 4. Navigate to a page, bookmark it and save in the folder that was created 5. Open another page and bookmark it on the "other bookmarks" folder 6. Copy the latest bookmarked page and go to the first folder and click right button and paste it. [Expected results]: The page should be pasted into the folder [Actual Results]: The page is pasted outside the folder. [Note]: This issue appears on the "show your bookmarks" and "menu bar bookmarks" For more information please see the attachment.
I tested this on Mac using the bookmarks toolbar. When pasting I sometimes see: ReferenceError: reference to undefined property "dropNearNode" controller.js:49:1 It doesn't seem to be a regression, goes back to at least 50 (I wouldn't be surprised if it was like that from the start).